Question

Factor w squared minus 81

Answer 1

The answer is (w-9)(w+9).

Answer 2

(w - 9)(w + 9)

Explanation:

w² - 81 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b)

then

w² - 81

= w² - 9²

= (w - 9)(w + 9)