Question

quanto da -4x²-2x=0?

Answer 1

-4x²-2x=0
∆=(-2)²-4.(-4).0
∆=√4

x=2±√4÷2.(-4)
x=2±2÷8

x1=2+2÷(-8)=-1/2
x2=2-2÷(-8)=0

Answer 2

$-4x^2-2x=0\text{ (Colocando o x em evidencia)}\\-x\cdot \left(4x+2\right)=0\\\\\bold{x_1=0}\\\\4x_2+2=0\\4x_2=-2\\x_2=-2\div 4\\\bold{x_2=-\frac{1}{2}}\\\\\\\boxed{\bold{\text{Logo: }S=\left\{-\dfrac{1}{2},0\right\}}}$