Q23 of 134 Page 4


Using factorization, find the roots of the quadratic equation: (2x + 3) 2=81.


(2x + 3) 2 = 81
(2x + 3) 2 – 9 2 = 0

Using a 2 – b 2 = (a – b)(a + b)
(2x + 3 – 9) (2x + 3 + 9) = 0
(2x – 6) (2x + 12) = 0
x = 3,  –6.

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