Question

x²-4x-10=11
∆=b²-4ac
​

Answer 1

Resposta:

${x }^{2} - 4x - 10 = 11 \\ ( { - 4}^{2} ) - 4 \times 1 \times ( - 10) - 11 \\ 16 - 4 \times ( - 21) \\ 16 + 84 \\ = 100$

$x \times \frac{ - b + - \sqrt{y} }{2 \times a } \\ x \times \frac{4 + - \sqrt{100} }{2 \times 1} \\ x \times \frac{4 + -10 }{2} \\ x = \frac{4 + 10}{2} = \frac{4}{2} = 7 \\ x = \frac{4 - 10}{2} = \frac{ - 6}{2} = - 3$

Espero ter ajudado :)