Question

Calculati
5x²-6x+7-11x²-2x
4(c+4)-6(x-7)
(x+9)(x-9)

Answer 1

$5x^{2}$-6x+7- $11x^{2}$-2x=
=$-6x^{2}$-8x
4(c+4)-6(x-7)=
4c+16-6x+42
4c-6x+58
(x+9)(x-9)-$x^{2}$-81
Sper ca te-am ajutat!:)

Answer 2

5x²-6x+7-11x²-2x=-6x²-8x+7
4(x+4)-6(x-7)=4x+16-6x+42=-2x+58=-2(x-29)
(x+9)(x-9)=x²-9²=x²-81