Exercise 5 Page 264

Solving a radical equation usually involves three main steps.

1. Isolate the radical on one side of the equation.
2. Raise each side of the equation to a power equal to the index of the radical to eliminate the radical.
3. Solve the resulting equation. Remember to check your results!

Now we can analyze the given radical equation. sqrt(10x+9)=x+3Let's notice that in this equation on the left-hand side there is an isolated radical with index equal to 2. Then, we will raise each side of the equation to the power of 2.

We obtained a quadratic equation. There are many ways to solve a quadratic equation. We will solve it by factoring it.

Checking the Solutions

Next, we will check the solutions by substituting 0 and 4 for x into the original equation. If the substitution produces a true statement, we know that our answer is correct. If it does not, then it is an extraneous solution. Let's first check the 0.

Because our substitution produced a true statement, we know that our answer, x=0, is correct. Let's check now the 4.

Because our substitution produced a true statement, we know that our answer, x=4, is correct.