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Cube Roots

Question 15Th...

Question

Question 15

The volume of a cube whose edge is 3x is

(a) $27 x^{3}$ (b) $9 x^{3}$ (c) $6 x^{3}$ (d) $3 x^{3}$

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Solution

We know that, the volume of a cube $= (S i d e)^{3}$
$= a^{3}$
$= (3 x)^{3}$ $[∵ a = 3 x, g i v e n]$
$= 27 x^{3}$

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Question 15

The volume of a cube whose edge is 3x is

(a) $27 x^{3}$ (b) $9 x^{3}$ (c) $6 x^{3}$ (d) $3 x^{3}$

A

2

B

A

A = 5 x^{2} + 3 x^{2} - 4 x + 1, B = 3 x^{3} + 5 x^{2} + 3 x - 8

C = 6 x^{3} - 4 x^{2} - 7 x + 3

(A + B) = C

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