Question

Which expression is equivalent to 64 - 9x^2?

Answer 1

(8-3x) (8+3x)

Explanation:

64 - 9x^2

We can factor this expression since the is the difference of squares

(a^2 - b^2) = (a-b) (a+b)

let 64 = a^2 so a =8

let 9x^2 = b^2 so b = 3x

64 - 9x^2 = (8-3x) (8+3x)