(1)x²+2x-99=0 (2)(x-1)(x+3)=12
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(1)x²+2x-99=0 (2)(x-1)(x+3)=12
(1)x²+2x-99=0 (2)(x-1)(x+3)=12
(1)x²+2x-99=0 (2)(x-1)(x+3)=12
x²+2x-99=0
(x+11)(x-9)=0
x1=-11,x2=9
(x-1)(x+3)=12
x²+2x-3=12
x²+2x-15=0
(x+5)(x-3)=0
x1=-5,x2=3