Question

-5a(a^4-6a^2+3)
(x+4)(3x-2)
(6m+5n)(7m-3n)
(x+5)(x^2+x-6)

Answer 1

$-5a(a^4-6a^2+3)=-5a^5+30a^3-15a \ \ (x+4)(3x-2)=3x^2-2x+12x-8=3x^2+10x-8 \ \ (6m+5n)(7m-3n)=42m^2-18mn+35mn-15n^2= \ =42m^2+17mn-15n^2 \ \ (x+5)(x^2+x-6)=x^3+x^2-6x+5x^2+5x-30= \ =x^3+6x^2-x-30$