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256 . 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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প্রতিরক্ষা মন্ত্রণালয়ের মিলিটারি ইঞ্জিনিয়ার সার্ভিসেস | স্টোরম্যান | ১৮.০৫.২০১৮

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

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

258 . $x^{2} + y^{2} + z^{2} = 2, x + y + z = 2$ 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

259 . $a - \frac{1}{a} = 3$ 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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প্রাথমিক বিদ্যালয় প্রধান শিক্ষক নিয়োগ পরীক্ষা-2009-(শিউলী-06) (09-09-2009)

260 . 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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261 . x2-4x-1=0 হলে , $x - \frac{1}{x}$ এর মান কত?

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

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Answer: Option A

Explanation:

x^{2} - 4 x - 1 = 0 \Rightarrow x^{2} - 1 = 4 x \Rightarrow x - \frac{1}{x} = 4

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262 . $x^{2} + y^{2} = x y$ হলে, ${(x + y)}^{4}$ এর মান কত?

A. $x^{2} y^{2}$
B. xy
C. ${(x^{2} + y^{2})}^{2}$
D. $9 x^{2} y^{2}$

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Answer: Option D

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পররাষ্ট্র মন্ত্রণালয় ব্যক্তিগত কর্মকর্তা ২৭.০৯.২০১৯

263 . $2 x + \frac{2}{y} = 4$ হলে x এর মান কত?

A. 2
B. 1
C. $\frac{1}{2}$
D. $\frac{1}{0}$

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Answer: Option B

Explanation:

There is wrong on this question.write question will be 2X + (2/X) = 4.As here only given one equation thats why unknown parameter must be 1.Then what will be the value of X = ? if we put X = 1,then LHS = 4 & RHS = 4 Ans:1

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বাংলাদেশ পাবলিক সার্ভিস কমিশন -২০১৯ পদের নাম : বিভিন্ন মিন্ত্রণালয়ের প্রশাসনিক কর্মকর্তা ( ১৬-০৯-২০১৯)

264 . $a^{2} - 6 a + 1 = 0$ হলে $a + \frac{1}{a} = ?$

A. $\sqrt{3}$
B. $3 \sqrt{3}$
C. 6
D. 9

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Answer: Option C

Explanation:

দেওয়া আছে, a^{2} -6a+1=0 \Rightarrow a^{2} + 1 = 6 a \Rightarrow \frac{a^{2} + 1}{a} = \frac{6 a}{a} \Rightarrow \frac{a^{2}}{a} + \frac{1}{a} = 6 \Rightarrow a + \frac{1}{a} = 6

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265 . $x^{y} = y^{x}, x = 2 y (x \neq 0, y \neq 0)$ হলে,(x,y) = কত?

A. (8,4)
B. ( 6,3)
C. (2,1)
D. (4,2)

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Answer: Option D

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266 . ${(x^{2})}^{3}$ কে $x^{3}$ দ্বারা গুণ করলে কত হবে?

A. $x^{9}$
B. $x^{18}$
C. $x^{27}$
D. $x^{24}$

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Answer: Option A

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267 . $a^{5} . a . a^{- 6}$ = কত?

A. a
B. $a^{2}$
D. 1

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Answer: Option D

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268 . $\frac{x}{a} + a = \frac{x}{b} + b$ হলে ,x এর মান কত ?

A. ab
B. a
C. b
D. a/b

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Answer: Option A

Explanation:

\frac{x}{a} + a = \frac{x}{b} + b \Rightarrow \frac{x}{a} - \frac{x}{b} = b - a \Rightarrow \frac{b x - a x}{a b} = b - a \Rightarrow \frac{x (b - a)}{a b} = b - a \Rightarrow x = \frac{a b (b - a)}{(b - a)} ∴ x = a b

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269 . $2^{x} + 2^{1 - x} = 3$ হলে, x = কত?

A. (1,2)
B. (0,2)
C. (1,3)
D. (0,1)

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Answer: Option D

Explanation:

2^{x} + 2^{1 - x} = 3 \Rightarrow 2^{x} + \frac{2^{1}}{2^{x}} = 3 \Rightarrow a + \frac{2}{a} = 3 [2^{x} = a] \Rightarrow a^{2} + 2 = 3 a \Rightarrow a^{2} - 3 a + 2 = 0 \Rightarrow a^{2} - 2 a - a + 2 = 0 \Rightarrow a (a - 2) - 1 (a - 2) = 0 \Rightarrow (a - 1) (a - 2) = 0 এখন, a-2=0                             আবার, a-1=0 a = 2 a = 1 \Rightarrow 2^{x} = 2^{1} \Rightarrow 2^{x} = 2^{0} \Rightarrow x = 1 \Rightarrow x = 0 ∴ x = 1, 0

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রেলপথ মন্ত্রণালয় ।। কম্পিউটার অপারেটর (12-06-2021)

270 . $5 (1 - x) + 3 (2 - x) = - 29$ সমীকরণের সমীকরণ হবে-

A. 4
B. 8
C. 5
D. 10

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Answer: Option C

Explanation:

5 (1 - x) + 3 (2 - x) = - 29 \Rightarrow 5 - 5 x + 6 - 3 x = - 29 \Rightarrow - 8 x = - 40 \Rightarrow x = 5

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বিভিন্ন মন্ত্রণালয়/বিভাগ/অধিদপ্তর | ব্যক্তিগত কর্মকর্তা (সাধারণ) | ১২.০৩.২০১৮

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