Question

УПРОСТИТЕ ВЫРАЖЕНИЕ ПЛИЗ

$(x-3)^{2} -(x+3) ^{2} +18 x^{2}$

Answer 1

x²-6x+9-x²-6x-9+18x²=18x²-12x

Answer 2

(x-3)^2 -(x+3)^+18x^2=
=x^2-6x+9-x^2-6x-9+18x^2=
=18x^2-12x.