Solve the following quadratic equations: (a) x 2 = 81 (b) x 2 = 36 (c) 2x

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Solve the following quadratic equations:
(a) x2 = 81 

(b) x2 = 36 

(c) 2x2 = 8
(d) (x − 1)2 = 9 

(e) (x + 5)2 = 16

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