Answer :
(x + 5) 2 – 36 = 0
(x + 5) 2 – 6 2 = 0
Using a 2 – b 2 = (a – b)(a + b)
(x + 5 – 6)(x + 5 + 6) = 0
(x – 1)(x + 11) = 0
x = 1, –11
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