Question

 Resolva esta equação seno U=IR x²-12x+20=0

Answer 1

$x^{2} -12x + 20 = 0$

$\frac{-b \pm \sqrt{-b^2 -4*a*c}}{2*a}$

a=1
b=−12
c=20

Vamos encontrar o valor de Delta

Δ=b2−4ac
Δ=(−12)2−4⋅(1)⋅(20)
Δ=144−80
Δ=64

$x =\frac{-b \pm \sqrt{\triangle}}{2*a} \\ \\ x = \frac{-(-12) \pm \sqrt{64}}{2*1} \\ \\ x = \frac{12 \pm {8}}{2} \\ \\ \\ x' = \frac{12 + {8}}{2} \\ \\ x' = \frac{20}{2} \\ \\ x' = 10 \\ \\ \\ x'' = \frac{12 - {8}}{2} \\ \\ x'' = \frac{4}{2} \\ \\ x'' = 2 \\ \\ \\ S= \left \{ 10, 2 \right. \}$