Answer
$-3x^4+3x^2+4x$
Work Step by Step
Add the polynomials by adding the similar terms (which are found in columns) to obtain:
$=-3x^4+(6x^2+(-3x^2))+(2x+2x)+(-4+4)
\\=-3x^4+3x^2+4x+0
\\=-3x^4+3x^2+4x$
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