.com-subject-bank-job-math-5?page=18-BD-Merit-Freelancing,-BCS,-Bank,-Primary,-Admission,-NTRCA

256 . $x^{3} + 6 x^{2} y + 11 x y^{2} + 6 y^{3}$ এর উৎপাদকে বিশ্লেষণ কোনটি?

A. (x+y)(x+3y)(x+5y)
B. (x+y)(x+2y)(x+3y)
C. (x+y)(x+4y)(x+3y)
D. (x-y)(x+y)(x+2y)

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

x^{3} + 6 x^{2} y + 11 x y^{2} + 6 y^{3} = x^{3} + x^{2} y + 5 x^{2} y + 5 x y^{2} + 6 x y^{2} + 6 y^{3} = x^{2} (x + y) + 5 x y (x + y) + 6 y^{2} (x + y) = (x^{2} + 5 x y + + 6 y^{2}) (x + y) = (x^{2} + 3 x y + 2 x y + 6 y^{2}) (x + y) = \{x (x + 3 y) + 2 y (x + 3 y)\} (x + y) = (x + 3 y) (x + 2 y) (x + y) = (x + y) (x + 2 y) (x + 3 y)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

১৮ তম শিক্ষক নিবন্ধন পরীক্ষা (স্কুল পর্যায়) (15-03-2024)

257 . $x^{2} - 7 x + 6$ এর উৎপাদকে বিশ্লেষিত রুপ নিচের কোনটি?

A. (x -2) (x-3)
B. (x-1) (x+8)
C. (x-1) (x-6)
D. (x+1) (x+6)

View Answer	Favorite Question	Report

Answer: Option C

Explanation:

x^{2} - 7 x + 6 = x^{2} - 6 x - x + 6 = x (x - 6) - 1 (x - 6) = (x - 1) (x - 6)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

কারিগরি শিক্ষা অধিদপ্তর (হিসাব সহকারী/অফিস সহকারী কাম কম্পিউটার অপারেটর) 20-08-2021 || 2021

258 . a ও b দুটি পূর্ণ সংখ্যা হলে $a^{2} + b^{2}$ এর সাথে কোন সংখ্যাটি যোগ করলে পূর্ণবর্গ সংখ্যা হবে-

A. ab
B. 2ab
C. 3ab
D. -ab

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

কারন , {(a + b)}^{2} {= a}^{2} {+2ab+b}^{2}

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

প্রাথমিক বিদ্যালয় সহকারী শিক্ষক নিয়োগ পরীক্ষা-2019-(৩য় ধাপ-৩৬৯৭-02) (26-06-2019)

259 . $x^{2} - 9 x + 20$ এর উৎপাদক সমূহ কোনটি ?

A. (x+5) (x+4)
B. (x-5) (x-4)
C. (x+5) (x-4)
D. (x-5) (x+4)

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

x^{2} - 9 x + 20 = x^{2} - 5 x - 4 x + 20 = x (x - 5) - 4 (x - 5) = (x - 5) (x - 4)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

260 . $a^{3} - 9 + {(a + 1)}^{3}$ রাশিটির উৎপাদক (a - 1) এবং অপর একটি উৎপাদক?

A. $2 a^{2} + 5 a + 8$
B. $2 a^{2} - 5 a + 8$
C. $2 a^{2} - 6 a + 8$
D. $2 a^{2} + 5 a - 8$

View Answer	Favorite Question	Report

Answer: Option A

Explanation:

a^{3} - 9 + {(a + 1)}^{3} = a^{3} - 9 + a^{3} + 3 a^{2} + 3 a + 1 = 2 a^{3} + 3 a^{2} + 3 a - 8 = 2 a^{3} - 2 a^{2} + 5 a^{2} - 5 a + 8 a - 8 = 2 a^{2} (a - 1) + 5 a (a - 1) + 8 (a - 1) = (2 a^{2} + 5 a + 8) (a - 1)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

261 . $2 a^{2} + 7 a b - 15 b^{2}$ এর উৎপাদক বিশ্লেষন কত হয়?

A. (a+5b)(2a-3b)
B. (a-5b)(2a+3b)
C. (a-5b)(2a-3b)
D. (a-5b)(a+5b)

View Answer	Favorite Question	Report

Answer: Option A

Explanation:

2a²+7ab-15b²

=2a²+10ab-3ab-15b²

=2a(a+5b)-3b(a+5b)

=(2a-3b)(a+5b).

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

262 . $3 x^{3} + x - 10$ এর একটি উৎপাদক $x + 2$ হলে অপরটি কত?

A. $2 x - 5$
B. $2 x + 5$
C. $3 x - 5$
D. $3 x + 5$

View Answer	Favorite Question	Report

Answer: Option C

Explanation:

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

263 . $x^{2} - y^{2} + 2 y - 1$ এর একটি উৎপাদক $x + y - 1$ হলে, অপর উৎপাদক কত?

A. $x + y + 1$
B. $x - y + 1$
C. $x - y - 1$
D. $x - y$

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

x^{2} - y^{2} + 2 y - 1 = x^{2} - (y^{2} - 2 y + 1) = x^{2} - {(y - 1)}^{2} = (x + y - 1) (x - y - 1)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা-ফিল্ড অফিসার-০৮.১০.২০২১ || 2021

264 . $2 x^{2} + x - 15$ এর উৎপাদক কোনটি?

A. (x+3)(2x-5)
B. (x-3)(2x-5)
C. (x-3)(2x+5)
D. (x+3)(2x+5)

View Answer	Favorite Question	Report

Answer: Option A

Explanation:

2 x^{2} + x - 15 = 2 x^{2} + 6 x - 5 x - 15 = 2 x (x + 3) - 5 (x + 3) = (2 x - 5) (x + 3)

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

২৪ তম বিসিএস প্রিলিমিনারি টেস্ট (08-08-2003) || 2003

265 . b এর মান কত হলে $16 a^{2} - a b + 49$ রাশিটি পূর্ণবর্গ হবে ?

A. 48
B. 56
C. 49
D. 32

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

16a^2 -ab + 49 =(4a)^2 - ab +(7)^2 =(4a)^2 - 2.4a.7 + (7)^2 =(4a)^2 - 56a + (7)^2 [ দেখা যাচ্ছে b এর জায়গায় 56 বসালে রাশিটি পূর্ণবর্গ হবে ] তাই b =56

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

বাংলাদেশ পরিসংখ্যান ব্যুরো | পরিসংখ্যান সহকারী- 05-11-2021

266 . $x^{4} - x - 1 = 0$ হলে, $x - \frac{1}{x^{2}} =$ কত ?

B. 1
C. 2
D. 4

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

267 . m-n=x এবং mn = $6 x^{2}$ হলে $m^{3} - n^{3}$ = কত?

A. $19 x^{2}$
B. $19 x^{3}$
C. $18 x^{2}$
D. $18 x^{3}$

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

m^{3} - n^{3 = {(m - n)}^{3} + 3 m n (m - n) = x^{3} + 3.6 x^{2} . x = x^{3} + 18 x^{3} = 19 x^{3}}

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

১৬ তম বেসরকারি প্রভাষক নিবন্ধন পরীক্ষা (30-08-2019)

268 . $x^{2} + y^{2} + x^{2} = 5, x + y + z = 3$ হলে yz + zx -xy এর মান কত?

A. -5
B. -4
C. -3
D. -2

View Answer	Favorite Question	Report

Answer: Option D

Explanation:

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

269 . $a^{4} - 51 a^{2} + 1 = 0$ হলে $a - \frac{1}{a}$ এর মান কত?

A. $\pm 9$
B. $\pm 7$
C. $\pm 5$
D. $\pm 3$

View Answer	Favorite Question	Report

Answer: Option B

Explanation:

দেওয়া আছে, a^{4} - 51 a^{2} + 1 = 0 \Rightarrow a^{4} + 1 = 51 a^{2} \Rightarrow \frac{a^{4} + 1}{a^{2}} = \frac{51 a^{2}}{a^{2}} \Rightarrow \frac{a^{4}}{a^{2}} + \frac{1}{a^{2}} = 51 \Rightarrow a^{2} + \frac{1}{a^{2}} = 51 এখন, {(a - \frac{1}{a})}^{2} = {(a + \frac{1}{a})}^{2} - 4 . a . \frac{1}{a} = a^{2} + 2 . a . \frac{1}{a} + \frac{1}{a^{2}} - 4 = a^{2} + \frac{1}{a^{2}} - 2 = 51 - 2 = 49 ∴ a - \frac{1}{a} = \sqrt{49} = \pm 7

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

270 . $4 x^{2} - 2$ হতে কত বিয়োগ করলে রাশিটি পূর্ণবর্গ হবে?

A. $- \frac{1}{4 x^{2}}$
B. $- \frac{1}{2 x^{2}}$
C. $\frac{1}{4 x^{2}}$
D. $\frac{1}{2 x^{2}}$

View Answer	Favorite Question	Report

Answer: Option A

Explanation:

4 x^{2} - 2 = {(2 x)}^{2} - 2.2 x . \frac{1}{2 x} + {(\frac{1}{2 x})}^{2} - {(\frac{1}{2 x})}^{2} = {(2 x - \frac{1}{2 x})}^{2} - \frac{1}{4 x^{2}} {সুতরাং, 4x}^{2} -2 হতে - \frac{1}{4 x^{2}} বিয়োগ করলে রাশিটি পূর্ণবর্গ হবে। {(2 x - \frac{1}{2 x})}^{2} - \frac{1}{4 x^{2}} - (- \frac{1}{4 x^{2}}) = {(2 x - \frac{1}{2 x})}^{2} - \frac{1}{4 x^{2}} + \frac{1}{4 x^{2}} = {(2 x - \frac{1}{2 x})}^{2}

Wrong Question

Wrong Answer

Wrong Question Spelling

Wrong Answer Spelling

Wrong Explanation

কোর্স ক্যাটাগরি

প্রয়োজনীয় লিঙ্ক