What is: 2x(x + 5) + x (3x - 4)?

=2x^2+10x+3x^2-4x
=5x^2+6x

= 2x(x + 5) + x(3x - 4)
= 2x^2 + 10x + 3x^2 - 4x
= 5x^2 + 6x
= x(5x + 6)

Answer: x(5x + 6)

2x^2 + 10x + 3x^2 - 4x
5x^2 + 6x

2x^2+10x+3x^2-4x
= 5x^2+6x
dividing by x
5x+6=0
5x=-6
x=-6/7