1) 11x=-14
2)5a^2+5b^2
(х-4)^2-(х+1)(x+2)=x^2-8x+16-(x^2+2x+x+2)=x^2-8x+16-x^2-2x-x-2=-11x+14
5(a+b)^2-10ab=5(a^2+2ab+b^2)-10ab=5a^2+10ab+5b^2-10ab=5a^2+5b^2=5(a^2+b^2)
1) 11x=-14
2)5a^2+5b^2
(х-4)^2-(х+1)(x+2)=x^2-8x+16-(x^2+2x+x+2)=x^2-8x+16-x^2-2x-x-2=-11x+14
5(a+b)^2-10ab=5(a^2+2ab+b^2)-10ab=5a^2+10ab+5b^2-10ab=5a^2+5b^2=5(a^2+b^2)