How to add polynomials

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PSAT Math › How to add polynomials

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Add the polynomials.

$(x^{2}+5x+12) + (3x^{3}+3x+8)$

$3x^{3}+x^{2}+8x+20$

CORRECT

$4x^{3}+2x^{2}+4x+14$

$4x^{2}+8x+20$

$3x^{3}+x^{2}+6x+17$

Explanation

We can add together each of the terms of the polynomial which have the same degree for our variable. $(3x^{3}) + (x^{2}) + (5x+3x) + (12+8) = 3x^{3}+x^{2}+8x+20$

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