Question

How can the difference of squares, 4x^2 - 25, be written in factored form?

(2x + 5)(2x + 5)

(2x - 5)(2x - 5)

(2x - 5)(2x + 5)

(2x - 5)^2

Answer 1

3. Binomial Formula: ( a + b ) ( a - b ) = a^2 - ab + ba - b^2 = a^2 - b^2
4x^2 - 25 = (2x - 5)(2x + 5)