Question

Resolva a equação do 2 grau 2x2+5x-8=0

Answer 1

$2 {x}^{2} + 5x - 8 = 0 \\ \\ delta = 25 - 4 \times 2 \times - 8 \\ delta = 25 + 64 \\ delta = 89 \\ x = \frac{ - 5 + - \sqrt{89} }{4} \\ x = \frac{ - 5 + - 9.4}{4} \\ x1 = \frac{ - 5 + 9.4}{4} \\ x1 = \frac{4.4}{4} \\ x1 = 1.1 \\ x2 = \frac{ - 5 - 9.4}{4} \\ x2 = \frac{ - 14.4}{4} \\ x2 = 3.6$