How do you combine #(9x ^ { 2} - 4x + 21) + ( 2x ^ { 2} + 9x - 57)#?

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Answer 1 · 2017-09-02T23:33:42

See a solution process below:

First, remove all of the terms from parenthesis. Be careful to handle the signs of each individual term correctly:

#9x^2 - 4x + 21 + 2x^2 + 9x - 57#

Next, group like terms:

#9x^2 + 2x^2 + 9x - 4x + 21 - 57#

Now, combine like terms:

#(9 + 2)x^2 + (9 - 4)x + (21 - 57)#

#11x^2 + 5x + (-36)#

#11x^2 + 5x - 36#