Equations with Two Radical Terms
A general strategy for solving radical equations, including those with two radical terms, is as follows.
SOLVING RADICAL EQUATIONS
To solve radical equations:
a. Isolate one of the radical terms.
b. Use the principle of powers.
c. If a radical remains, perform steps (a) and (b) again.
d. Check possible solutions.
Applications
Speed of Sound. Many applications translate to radical equations. For example,
at a temperature of t degrees Fahrenheit, sound travels S feet per second,
where
S = 21.9 
.