Question

a, 2x(x-5)

b, 3x(x-7)+x

c, (3x-2)(x+1)-2x

Answer 1

`a,2x(x-5)=2x.x+2x.(-5)=2x^2-10x`

`b,3x(x-7)+x=3x.x+3x.(-7)+x=3x^2-21x+x=3x^2-20x`

`c,(3x-2)(x+1)-2x=3x.x+3x.1-2.x-2.1-2x=3x^2+3x-2x-2-2x=3x^2-x-2`

Answer 2

\(a, 2x(x-5)=2x.x-2x-5=2x^2-10x\)

\(b, 3x(x-7)+x=3x.x-3x.7+x=3x^2-21x+x=3x^2-20x\)

\(c, (3x-2)(x+1)-2x=3x^2+3x-2x-2-2x=3x^3-x\)