ANSWER ALL OF THEM AND I WILL MAKE A QUESTION JUST FOR YOU FOR FREE POINTS!! FIND THE MISSING FACTORS

1)3x^3+12x^2-9x=3x

3x^3+12x^2-9x-3x=3x-3x

3x^3+12x^2-12x=0

3x(x^2+4x-4)=0

3x=0 or x^2+4x-4=0

x=0 or x=0.8284271247461903 or x=-4.82842712474619

2)x^2+8x-20=x+10

x^2+8x-20-(x+10)=x+10-(x+10)

x^2+7x-30=0

(x-3)(x+10)=0

x-3=0 or x+10=0

x=3 or x=-10

Answer : x=3 or x=-10

0.6

39mph

step-by-step explanation: