Chapter 6 Rational Exponents and Radical Functions - 6.6 Solve Radical Equations - 6.6 Exercises - Quiz for Lessons 6.5-6.6 - Page 459: 8

$$x=4$$

Work Step by Step

We solve the equation using the rules of exponents and radicals. Note, if we wanted to check our solution, we could plug the value we get back into the original equation to see if it yields a true statement. Solving the equation, we find: $$\left(7x+8\right)^{\frac{3}{2}}=216 \\ \left(7x+8\right)^3=46656 \\ x=4$$ We see that this solution is not extraneous.

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