Question

quantos que é : x. (x-1) = 132

Answer 1

$x(x-1)=132\\x^2-x=132\\x^2-x-132=0\\ \\\Delta=(-1)^2-4.1(-132)\\\Delta=1+528\\\Delta=529$


$x= \frac{-b\pm\sqrt\Delta}{2a} \\ \\x= \frac{1\pm23}{2} \\ \\x'=12\\ \\x''-11$

Answer 2

x(x-1) = 132
x² - x = 132
x² - x - 132 = 0

a = 1 
b = -1
c = -132

Agora só usar a fórmula de Bháskara.