Question

9. (3x + 4y)² – (3z) 2square
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Answer 1

(3x + 4y - 3z)(3x + 4y + 3z)

Explanation:

(3x + 4y)² - (3z)² ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b)

Here a = 3x + 4y and b = 3z, then

(3x + 4y)² - (3z)²

= (3x + 4y - 3z)(3x + 4y + 3z) ← in factored form

Answer 2

solution: (3x + 4y - 3z) x (3x + 4y + 3z)