Question

Упростите:
a) (3x+1)(x-4)+(2x-7)(x+2)
б) (4a-2x)(3a+x)-(6a-x)(2a+2x)

Answer 1

$(3x+1)(x-4)+(2x-7)(x+2)=\\=3x^2-12x+x-4+2x^2+4x-7x-14=\\=5x^2-14x-18$

$(4a-2x)(3a+x)-(6a-x)(2a+2x)=\\=12a^2+4ax-6ax-2x^2-(12a^2+12ax-2ax-2x^2)=\\=12a^2+4ax-6ax-2x^2-12a^2-10ax+2x^2=\\=-12ax$