Question

add the following:
a.
$3x {} ^ {2} + 7x + 7 \: \: 9x {}^{2} - 2x + 5$
$2x {}^4 + 15x { }^{2} + 7x - 1 \: \: 4x {}^{4} - x {}^{3} + 9x {}^{3} + 2x + 11$
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Answer 1

Step-by-step explanation:

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