Question

140= x+6. X+2 qual a resposta dessa equação?!

Answer 1

$140=(x+6)(x+2)\\ x^2+8x+12-120=0\\ x^2+8x-128=0\\ \\ \Delta=8^2-4.1.(-128)=64+512=576\\ \\ x=\frac{-8\pm24}{2}\\ \\ x_1=-16\\ \\ x_2=8$

Answer 2

140 = (x + 6) . (x + 2)
140 = x² + 8x + 12
-x² - 8x + 128 . (-1)
x² + 8x - 128 = 0


Δ = b²−4ac
Δ = (8)²−4⋅1⋅−128
Δ = 64 + 512  
Δ = 576

$x = \dfrac{-b \pm \sqrt{\Delta}}{2*a}\\ \\ \\ x = \dfrac{-8 \pm \sqrt{576}}{2*1}\\ \\ \\ x = \dfrac{-8 \pm 24}{2}\\ \\ \\ x' = \dfrac{-8 - 24}{2}\\ \\ \\ x' = \dfrac{-32}{2}\\ \\ \\ x' = -16\\ \\ \\ x'' = \dfrac{-8 + 24}{2}\\ \\ \\ x'' = \dfrac{16}{2}\\ \\ \\ x'' = 8$

S = {-16,  8}