Question

7x elevado a 2+2x-9=0 equação do 2 grau​

Answer 1

7x² + 2x - 9 = 0

∆ = 2² - 4.7.(-9)

∆ = 4 + 252

∆ = 256

$x = \frac{ - 2 + - \sqrt{256} }{2 \times 7}$

$x = \frac{ - 7 + - 16}{14}$

$x1 = \frac{ - 2 + 16}{14 } \\ x2 = \frac{ - 2 - 16}{14}$

$x1 = 1 \\ x2 = - \frac{9}{7}$