Question

qual é o resultado dessa equação incompleta

-2x²=8x

Answer 1

-2x²=8x
-2x²-8x .(-1)=0
2x²+8x = 0

Δ= b²-4ac
Δ= 8²-4.2.0
Δ= 64+0
Δ= 64

x= -b+-√Δ/2a
x= -(+8)+-√64/2x2
x= -8+-√64/4

x'= -8+8/4             x''= -8-8/4
x'= 0/4                 x''= -16/4
x'=0                    x''= -4

S:{0;-4}

Answer 2

$-2 x^{2} =8x\\\\ -2 x^{2} -8x=0\\\\\\ x(-2x-8)=0\\\\\\ x=0\\\\ -2x-8=0\to -2x=8\to x= \frac{8}{-2} \to x=-4\\\\\\\ S=(-4;0)$