Answer:
7x^2+6x
Step-by-step explanation:
(x^2 + 4x) + (6x^2+2x)
Rewrite or remove the parenthesis
=x^2+4x+6x^2+2x
Collect like terms (the x^2 added to 6x^2)
=7x^2+4x+2x
Collect like terms (the 4x added to 2x)
=7x^2+6x
