Question

(x+1)(x+3)-2x(x-6)=15​

Answer 1

(x+1)(x+3)-2x(x-6)=15

x²+3x+x+3-2x²-12x =15

-x²+4x+3-12x-15=0

-x²-8x-12=0

-(x²+8x+12)=0

x²+8x+12=0

x²+(6+2)x+12=0

x²+6x+2x+12=0

x(x+6)+2(x+6)=0

(x+2)(x+6)=0

so the ans. is --

x=-2 and x=-6