# radical equation

posted by
**jessica** on
.

2^x+20=15+3^x

A)1

B)16

C)-5

D)25

I chose c but i got it wrong i am having a problem understanding it.

Let me rewrite the question in a more standard format.

2* sqrt(x)+20=15 + 3*sqrt(x)

where * means multiply, and sqrt means the square root. Your use of ^ for square root is unusual, normally, we use the carat sign, ^, as an exponent..for instance, 2 cubed will be 2^3.

Ok, your problem.

2* sqrt(x)+20=15 + 3*sqrt(x)

gather your terms..

2* sqrt(x)- 3*sqrt(x) =15 - 20

- sqrt(x)=-5

square both sides...

x=25