Question

mim ajude por favor???​

Answer 1

Resposta:

2x²-10-8x=0

a=2

b=-8

c=-10

∆=(-8)²-4.2.-10

∆=64+80

∆=144

$x = \frac{ - ( - 8) + \sqrt{144} }{2 \times 2} = \frac{8 + 12}{4} = \frac{20}{4} = x = 5$

$x = \frac{ - ( - 8) - \sqrt{144} }{2 \times 2} = \frac{8 - 12}{4} = \frac{ - 4}{4} = - 1$

c) -1, 5