Question

usando fórmula de Bhaskara

4 + X (x - 4) =x​

Answer 1

Resposta:

S={1,4}

Explicação passo-a-passo:

4 + x(x-4)=x

4 + x² -4x - x= 0

x² - 5x + 4 =0

a=1

b=-5

c=4

Δ=b²-4ac

Δ=(-5)²-4(1)(4)

Δ=25-16

Δ=9

$x={-b\pm\sqrt{\Delta} \2a}={-(-5)\pm\sqrt{9} \over2.(1)}={5\pm3\over2}\\ \\ x_1={5-3\over2}={2\over2}=1\\ \\ x_2={5+3\over2}={8\over2}=4$