(5x-3)(x+1)=(x+1)^2+55x²+5x-3x-3=x²+2x+1+54x²-9=0(2x+3)(2x-3)=0x1=-1.5, x2=1.5
(5x-3)(x+1)=(x+1)^2+5(5x-3)(x+1)-(x+1)^2-5=0(5x-3-x-1)(x+1)-5=0(4x-4)(x+1)-5=04(x-1)(x+1)-5=04(x²-1)-5=04x²-4-5=0x²=9/4x=±3/2