Question

como resolver x(x+2)=2x+25

Answer 1

x(x+2)=2x+25 
x² + 2x = 2x + 25
x² + 2x - 2x = 25
x² = 25
x = √25
x = 5 

Answer 2

x(x=2)=2x+25    Δ=b²-4.a.c  =Δ=0-4.2.(-25) Δ  x=-b+-√Δ/2.a
x²+2x=2x+25                         Δ=200
x²+2x-2x-25=0

x1= -(0)+√200/2.2     x2=-√200/2.2
x1=10√2/2=5√2        x2=-10√2/2=-5.√2