solve the given equation by the method of completing the squares : xsquare + 12x - 45 = 0
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x²+12x-45 = 0
x²+12x-45+(12/2)²-(12/2)²=0
x²+12x+36-45-36 = 0
(x+6)² = 45+36
(x+6)² = 81
x+6 = 9 or -9
=> x = 9-6 = 3
or x = -9-6 = -15
x²+12x-45+(12/2)²-(12/2)²=0
x²+12x+36-45-36 = 0
(x+6)² = 45+36
(x+6)² = 81
x+6 = 9 or -9
=> x = 9-6 = 3
or x = -9-6 = -15
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