Question

Me ajudem ai com esta conta
×2+(×+1)2=25

Answer 1

×^2+(× + 1)^2=25
x^2 + x^2 + 2x + 1 = 25
2x^2 + 2x + 1 - 25 = 0
2x^2 + 2x - 24 = 0 (:2)
x^2 + x - 12 = 0
a= 1; b = 1; c = - 12
∆= b^2-4ac
∆ = 1^2 - 4.1.(-12)
∆ = 1 + 48
∆ = 49

x = [ - b +/- √∆]/2a
x = [ - 1 +/- √49]/2.1
x = [ - 1 +/- 7]/2

x' = [ - 1 - 7]/2 = - 8/2 = - 4
x" = [ - 1 + 7]/2 = 6/2 = 3