The polynomial is a difference of perfect squares. Use the formula a2 - b2 = (a + b) (a - b) to factor completely. 81x2 - 49 The value of a is. The value of b is. The product of the prime factors is.

To answer your question: Rewrite 81 x2 as (9x) 2. (9x) 2 - 49 Rewrite 49 as 72. (9x) 2 - 72 Both terms are perfect squares, factor using the difference of squares formula, a2 - b2 = (a+b) (a - b) where a = 9x and b=7. (9x + 7) (9x - 7)