Question

X elevado a dois-x-90=0

Answer 1

Bom dia

x²-x-90=0 

Usando Bhaskara:

$\frac{-(-1)+- \sqrt{(-1)^2-4*(1)*(-90)} }{2*1} = \frac{1+- \sqrt{361} }{2} = \frac{1+-19}{2}$

x1= (1+19)/2= 10
x2= (1-19)/2= -9