Question

rezolvați ecuațiile
a) x^2+6x=16
b) x^2-2x=8

Answer 1

a) x²+6x = 16
x²+6x-16 = 0

∆ = b²-4ac
∆ = 36+64
∆ = 100

x1 = (-b+√∆)/2a
x1 = (-6+10)/2
x1 = 4/2
x1 = 2.

x2 = (-b-√∆)/2a
x2 = (-6-10)/2
x2 = -16/2
x2 = -8.



b) x²-2x = 8
x²-2x-8 = 0

∆ = b²-4ac
∆ = 4+32
∆ = 36.


x1 = (-b+√∆)/2a
x1 = (2+6)/2
x1 = 8/2
x1 = 4.

x2 = (-b-√∆)/2a
x2 = (2-6)/2
x2 = -4/2
x2 = -2.




Succès ! :)