Question

e) 15x⁵ – 18x⁴ - 21x³=
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Answer 1

Resposta:

$15x^5-18x^4-21x^3\\\\x^4=xx^3\\\\x^5=x^2x^3\\\\=15x^2x^3-18xx^3-21x^3\\\\\mathrm{Reescrever\:}21\mathrm{\:como\:}3\cdot \:7\\\\\mathrm{Reescrever\:}18\mathrm{\:como\:}3\cdot \:6\\\\\mathrm{Reescrever\:}15\mathrm{\:como\:}3\cdot \:5\\\\=3\cdot \:5x^2x^3-3\cdot \:6xx^3-3\cdot \:7x^3\\\\=3x^3\left(5x^2-6x-7\right)$

Explicação passo a passo: