Question

8- A solução da equação x2 - 7x + 12 = 0 é:
a) s = {3,4} b) s = {3,5} c) s = {1,3} d) s = {5,3}

Answer 1

Olá

$x^2 - 7x + 12 = 0\\\\x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{\left(-7\right)^2-4\cdot \:1\cdot \:12}}{2\cdot \:1}\\\\x_{1,\:2}=\frac{-\left(-7\right)\pm \:1}{2\cdot \:1}\\\\x_1=\frac{-\left(-7\right)+1}{2\cdot \:1},\:x_2=\frac{-\left(-7\right)-1}{2\cdot \:1}\\\\\huge\orange{\mathtt{\boxed{\boxed{x'=4,\:x''=3}}}}$

>< a) s = {3,4} ><

Espero ter ajudado!