Answer :

igoroleshko156

Answer:

13x^2 - 10x - 17

Step-by-step explanation:

Step 1:  Add them together

( 3x^2 + 11x + 20) + ( 10x^2 - 21x - 3)

3x^2 + 11x + 20 + 10x^2 - 21x - 3

13x^2 - 10x - 17

Answer:  13x^2 - 10x - 17

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