Question

4x elevado a 2 x + 8x -5=0
​

Answer 1

Resposta:

S={1/2 , -5/2}

Explicação passo-a-passo:

$4x {}^{2} + 8x - 5 = 0$

a=4, b=8 e c=-5

delta =b²-4ac

delta =8²-4x4x-5=64+80=144

$\sqrt{144} = 12$

$x1 = \frac{ - 8 + 12}{2 \times 4} = \frac{4}{8} = \frac{1}{2}$

$x2 = \frac{ - 8 - 12}{2 \times 4} = \frac{ - 20}{8} = \frac{ - 5}{2}$