Question

Which is an expression for the volume of the prism?(V = lwh )

A. x^2 + 4x - 5
B. x^2 + 6x + 5
C. 3x^2 + 12x - 15
D. 3x^2 + 18x + 15

Answer 1

C. 3x² + 12x - 15

Explanation:

length (L) = x - 1

width (w) = x + 5

height (h) = 3

Volume (V)

= L * W * h

= ( x - 1) ( x + 5) 3

= 3 ( x² + 5x - x - 5)

= 3 ( x² + 4x - 5)

= 3x² + 12x - 15

Hope it will help :)