Question

2) Encontre o valor de f(x) = x2 + 7X – 10 para que f(x) = 0​

Answer 1

Explicação passo-a-passo:

$f(x)=x^2+7x-10\\f(x)=0\\\\x^2+7x-10=0$

utilizando Bhaskara:

$\boxed{x=\frac{-b \pm \sqrt{b^2-4ac} }{2a} }$

sendo:

a=1

b=7

c=-10

$x=\frac{-7 \pm \sqrt{7^2-4*1*(-10)} }{2*1} \\\\x=\frac{-7 \pm \sqrt{89} }{2}\\\\x_{1}=\frac{-7+\sqrt{89} }{2} \approx \boxed{1,22} \\\\x_{2}=\frac{-7-\sqrt{89} }{2} \approx \boxed{-8,22}$