Question

calculo da equação x²-3x-10=0

Answer 1

x²-3x-10=0
x²-3x=10
x=3+-$\sqrt \frac{(3-) ^{2} -4x1x-10}{2x1}$
x=3+-$\sqrt \frac{(-3) ^{2} -4x-10}{2}$
x=3+-$\sqrt \frac{3 ^{2} -4x-10}{2}$
x=3+-$\sqrt \frac{9+40}{2}$
x=3+-$\sqrt \frac{49}{2}$
x=$\frac{3+-7}{2}$
$\left \{ {{x= \frac{3+7}{2} } \atop {x= \frac{3-7}{2} }} \right.$
$\left \{ {{x= \frac{10}{2} } \atop {x= \frac{-4}{2} }} \right.$
$\left \{ {{x=5} \atop {x=-2}} \right.$
x∈{-2,5}