Question

Which of the following polynomials is a difference of squares? *

10 points
x^2+16
x^2+6x+9
x^2+5x+4
x^2-9

Answer 1

x² - 9

Explanation:

A difference of squares has the form

a² - b²

Thus

x² - 9

= x² - 3² ← is a difference of squares