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28-10-2020
Mathematics

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What is the sum of 3x2+5x-6 and -x2+3x+9

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29-10-2020

Answer:

2x2+8x+3

Step-by-step explanation:

=3x2+5x+−6+−x2+3x+9

=(3x2+−x2)+(5x+3x)+(−6+9)

=2x2+8x+3

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