Question

Help please............​

Answer 1

(9x -2)(9x +2)

Explanation:

Each of the terms in the difference is a perfect square, so the "perfect square trick" applies. The factors are the sum and difference of the square roots of the given terms.

• √(81x²) = 9x
• √4 = 2

81x² - 4 = (9x +2)(9x -2)