Question

Does anyone know this and if it is extraneous or not?

Answer 1

addd 4 to both sides

`√(x+9)=5`
sqare both sides
x+9=25
minus 9 both sides
x=16

plug it in for x and see

`√(16+9)-4=1`

`√(25)-4=1`

`5-4=1`
1=1
true

not extraneous
an extraneous root would be x=-34