How do you combine like terms for #3x^2 + 21x + 5x + 10x^2#?

2 Answers
May 15, 2018

Answer:

See a solution process below:

Explanation:

First, group like terms;

#3color(red)(x^2) + 10color(red)(x^2) + 21color(blue)(x) + 5color(blue)(x)#

Now, combine the coefficients of the like terms:

#(3 + 10)color(red)(x^2) + (21 + 5)color(blue)(x)#

#13color(red)(x^2) + 26color(blue)(x)#

May 15, 2018

Answer:

Looks like you've already splitted the middle term

Explanation:

But splitting isn't what we need here.... add them up
#13x^2+26x#
Notice that both have #13x# as common...
Factorize
#13x(x+2)#