Question

quanto é |x|2-3|x|+2=0​

Answer 1

Resposta:

S ={-2,-1,1,2}

Explicação passo a passo:

| x |² - 3| x | + 2 = 0

| x | = y

y² - 3y + 2 = 0

Δ = (-3)² - 4.1.2

Δ = 9 - 8

Δ = 1

$x\frac{-(-3)\pm\sqrt{1} }{2.1} \\\\x=\frac{3\pm1}{2} \\\\x=\frac{2}{2} =1\\\\x=\frac{4}{2}=2\\\\|x|=1\\x=-1~~ou~~x=1\\ou|x|=2\\x=-2~~ou~~x~~=2$