x^2 +12x - 45 = 0 by method of completing square method
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x^2+12x-45=0
(x^2+12x+36)-45-36=0
(x+6)^2-81=0
(x+6)^2-(9)^2=0
(x+6-9)(x+6+9)=0
(x-3)(x+15)=0
x=3,-15
(x^2+12x+36)-45-36=0
(x+6)^2-81=0
(x+6)^2-(9)^2=0
(x+6-9)(x+6+9)=0
(x-3)(x+15)=0
x=3,-15
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