Question

reduza os termos semelhantes
${3x}^{4} + {2x}^{2} - {4x}^{4} + 5x - 7x {}^{2}$
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Answer 1

$3x^4+2x^2-4x^4+5x-7x^2=$

$3x^4-4x^4+2x^2-7x^2+5x=$

$-x^4-5x^2+5x$