Question

Determine if 9 - 4x2 is the difference of two squares and if it is, factor it.

Answer 1

Explanation:

9 = 3 * 3 = 3²

4x² = 2²x² = (2x)²

9 - 4x² = 3² - (2x)² {a² - b² = (a + b)(a - b) ; a = 3 ; b = 2x}

= (3 +2x)(3 - 2x)