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Removal of Brackets

Question 6In ...

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Question 6

In the following question out of the four options only one is correct, write the correct answer:

The value of x, for which the expressions 3x-4 and 2x+1 become equal, is:

(a) -3

(b) 0

(c) 5

(d) 1

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Solution

Given expressions 3x-4 and 2x+1 are equal.
Then, $3 x - 4 = 2 x + 1 \Rightarrow 3 x - 2 x = 1 + 4 ∴ x = 5$
Hence, the value of x is 5.

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Question 6

In the following question out of the four options only one is correct, write the correct answer:

The value of x, for which the expressions 3x-4 and 2x+1 become equal, is:

(a) -3

(b) 0

(c) 5

(d) 1

Question 6

In the following question, out of the four options, only one is correct. Write the correct answer:

The value of ${(\frac{2}{5})}^{- 2}$ is
(a) $\frac{4}{5}$
(b) $\frac{4}{25}$
(c) $\frac{25}{4}$
(d) $\frac{5}{2}$

Question 6

In the following question, out of the four options, only one is correct. Write the correct answer:

The value of ${(\frac{2}{5})}^{- 2}$ is
(a) $\frac{4}{5}$
(b) $\frac{4}{25}$
(c) $\frac{25}{4}$
(d) $\frac{5}{2}$

Question 4

In the following question, out of the four options, only one is correct. Write the correct answer:

The value fo $\frac{1}{4^{- 2}}$ is
(a) 16
(b) 8
(c) $\frac{1}{8}$
(d) $\frac{1}{8}$

Question 23

In the following question, out of the four options, only one is correct. Write the correct answer:

The value of $(7^{- 1} - 8^{- 1})^{- 1} - (3^{- 1} - 4^{- 1})^{- 1}$ :
(a) 44
(b) 56
(c) 68
(d) 12

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Removal of Brackets

Standard VI Mathematics

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