Question

raiz da equaçao-2x²-8x+7=0​

Answer 1

Explicação passo-a-passo:

-2x^2 - 8x + 7 = 0 (-1)

2x^2 + 8x -7 = 0

Answer 2

Resposta:

$x=\frac{-4-\sqrt{30} }{2} ~~ou~~x=\frac{-4+\sqrt{30} }{2}$

Explicação passo a passo:

-2x² - 8x + 7 = 0

2x + 8x - 7 = 0

$\Delta=b^2-4ac\\\\\Delta=8^2-4.2(-7)\\\\\Delta=64+56\\\\\Delta=120\\\\\Delta=4.30\\\\x=\frac{-b\mp\sqrt{\Delta} }{2a}\\\\x=\frac{-8\mp2\sqrt{30} }{4} \\\\x=\frac{-4\mp\sqrt{30} }{2}$