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226 . $x^{2} + y^{2} + b = 8, x y = 7$ হলে, ${(x + y)}^{2}$ এর মান কত?

A. ১৪
B. ১৬
C. ২২
D. ৩০

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Answer: Option C

Explanation:

দেওয়া আছে, x^{2} + y^{2} = 8 এবং xy = 7 এখন, x^{2} + y^{2} = 8 {(x + y)}^{2} - 2 xy = 8 (x + y) - 2 \times 7 = 8 {(x + y)}^{2} = 22

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প্রতিরক্ষা মন্ত্রণালয়ের মিলিটারি ইঞ্জিনিয়ার সার্ভিসেস | স্টোরম্যান | ১৮.০৫.২০১৮

227 . a+b+c=5 ab + bc +ca =12 হলে $a^{2} + b^{2} + c^{2} = ক ত ?$

A. 1
B. 2
C. 4
D. 3

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Answer: Option A

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228 . $f (x) = x^{3} + a x^{3} + 2 x^{3} = 0$ হলে, a এর মান কত?

A. 3
B. 1
D. -3

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Answer: Option D

Explanation:

f (x) = x^{3} + a x^{3} + 2 x^{3} = 0 \Rightarrow x^{3} (1 + a + 2) = 0 \Rightarrow a + 3 = 0 ∴ a = - 3

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পররাষ্ট্র মন্ত্রণালয় প্রশাসনিক কর্মকর্তা ২৫.১০.২০১৯

229 . $4 x^{2} + 7 x^{2} + 3 x^{2} = ?$

A. $14 x^{4}$
B. $14 x^{6}$
C. $14 x^{2}$
D. $12 x^{2}$

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Answer: Option C

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230 . x,y বাস্তব রাশি এবং $f (x, y) = x^{2} y^{2}$ , যদি $h (x) = (x^{2} - 5)$ হয় , তবে f(2, h(3)) এর মান কত?

A. 64
B. 16
C. 96
D. 32

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Answer: Option A

Explanation:

f (x, y) = x^{2} y^{2} এখানে, h (x) {=x}^{2} -5 \Rightarrow h (3) = 3^{2} - 5 \Rightarrow h (3) = 4 f (2, 4) = 2^{2} \times 4^{2} = 64

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231 . $16 x^{2} - 8 x + 9 = 0$ সমীকরণটির মূলদ্বয়ের যোগফল কত?

A. $\frac{3}{4}$
B. $\frac{1}{2}$
C. 144
D. $\frac{9}{16}$

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Answer: Option B

Explanation:

a x^{2} + b x + c = 0 সমীকরণের মূলের যোগফল= \frac{- b}{a} {16x}^{2} -8x+9=0 সমীকরণের মূলের যোগফল= \frac{- 8}{16} = \frac{1}{2}

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গণপূর্ত অধিদপ্তর | উপ-সহকারী প্রকৌশলী ও ড্রাফটম্যান/ সিভিল | ২৫.০১.২০১৮

232 . a এর মান কত হলে $9 - 12 x + a x^{2}$ রাশিটি একটি পূর্ণবর্গ হবে?

A. 8
B. 6
C. 1
D. 4

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Answer: Option D

Explanation:

9 - 12 x + a x^{2} = 32 - 2.3.2 x + a x^{2} রাশিমালা হতে স্পষ্ট a x^{2} = {(2 x)}^{2} হলে রাশিটি পূর্ণ বর্গ হবে। \Rightarrow a x^{2} = 4 x^{2} ∴ a = 4

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233 . a=5 হলে $a^{3} - 3 a^{2} - 1$ এর মান কত?

A. 124
B. 126
C. 64
D. 216

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Answer: Option C

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234 . $x y + 2 a y + 3 a x + 6 a^{2} = ?$

A. x(x+a)(y+3a)
B. (x+7a)(y+3a)
C. (x+5a)(y+3a)
D. (x+2a)(y+3a)

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Answer: Option D

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মৎস্য অধিদপ্তর নিয়োগ পরীক্ষা-২০১৮ | হিসাবরক্ষক

235 . $x^{2} + y^{2} + z^{2} = 2, x + y + z = 2$ হলে $(x y + x y + z x)$ এর মান কত?

B. 1
C. 2
D. 3

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Answer: Option C

Explanation:

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

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বিভিন্ন মন্ত্রণালয় | বিভাগ | অধিদপ্তর | প্রশাসনিক কর্মকর্তা | ০৫.০৩.২০১৮

236 . $a - \frac{1}{a} = 3$ হলে $a^{3} - \frac{1}{a^{3}}$ এর মান কত?

A. ৯
B. ১৮
C. ২৭
D. ৩৬

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Answer: Option D

Explanation:

a³ - (1/a)³ = {a - (1/a)}³ + 3.a.(1/a){a - (1/a)}

= 3³ + 3×3

= 27 + 9

= 36.

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প্রধান প্রশাসনিক কর্মকর্তার কার্যালয় ( প্রতিরক্ষা মন্ত্রণালয়) সহকারী পরিচালক ০৫.০৪.২০১৯

237 . যদি $x^{4} - x^{2} + 1 = 0$ হয়, তবে $x^{3} + \frac{1}{x^{3}} = ?$

A. ৩
B. ২
C. ১
D. ০

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Answer: Option D

Explanation:

x^{4} - x^{2} + 1 = 0 o r, x^{2} + \frac{1}{x^{2}} = 1 o r, x + \frac{1}{x} = \sqrt{3} এখন , x^{3} - \frac{1}{x^{3}} = {(x + \frac{1}{x})}^{3} - 3 . x . \frac{1}{x} . (x + \frac{1}{x}) = 3 \sqrt{3} - 3 \sqrt{3} = 0

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238 . X+Y=6 এবং XY=6 হলে, ${(X - Y)}^{2}$ এর মান কত ?

A. -12
B. 12
C. 8
D. 10

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Answer: Option B

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239 . যদি $x^{4} - x^{2} + 1 = 0$ হয়, তবে $x^{2} + \frac{1}{x^{2}} = ক ত ?$

A. 4
B. 2
C. 1

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Answer: Option C

Explanation:

x^{4} - x^{2} + 1 = 0 \Rightarrow x^{4} + 1 = x^{2} \Rightarrow x^{2} + \frac{1}{x^{2}} = 1 [x^{2} দ্বারা ভাগ করে]

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240 . x+y=4, xy=5 হলে, ${(x^{3} + y^{3})}^{2}$ এর মান কত ?

A. 16
B. 4
C. 8
D. 10

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Answer: Option A

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