-5(х+2)(х-3) розвязати
-5(х+2)(х-3)= -5 (x²+2x-3x-6)= -5 (x²-x-6)= -5x²+5x+30= -x²+x+6
-5(x+2)(x-3)=-5(x²-3x+2x-6)=-5(x²-x-6)=-5x²+5x+30