Question

-2x² + 8x = 0 Qual a raiz dessa esquaçao?

Answer 1

Resposta: a raize 4

Explicação passo-a-passo:

Answer 2

$Dados \begin{cases} & \text eqc= -2x^{2}+8x=0\end{cases}\\\\a=-1\\b=8\\c=0\\\\\\b^{2}-4.a.c\\\\8^{2}-4.(-2).0\\\\64-0\\\\\Delta = 64\\\\\frac{-b \frac{+}{-} \sqrt{64} }{2.a}\\\\\\\frac{-8 \frac{+}{-} 8 }{2.(-2)}\\\\\\\frac{-8 \frac{+}{-} 8 }{-4}=\\\\x'= \frac{-16}{-4}=4\\\\ x"= \frac{0}{-4}=0\\\\Portanto\ as\ raizes\ sao\ =(4,0)$