Question

−8x2(2y − 3x) multiply

Answer 1

Distributive property
a(b+c)=ab+ac
also
$(x^m)(x^n)=x^{m+n}$
so

$-8x^2(2y-3x)=-8x^2(2y)-8x^2(-3x)$=
$(-8)(x^2)(2)(y)+(-8)(x^2)(-3)(x^1)=-16x^2y+24x^3$