Question

What are the factors of x^2-25

A. (x-5)(x-5)
B. (x+5)(x-5)
C. (x-1)(x+25)
D. Prime

Answer 1

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

so

x^2 - 25

= x^2 - 5^2

= (x + 5)(x - 5)

Answer is B. (x + 5)(x - 5)