The period (in seconds) of a pendulum with a length of L (in meters) is given by the formula . If the period of a pendulum is is the length of the pendulum 156.8?
This concept is very similar to the previous two. When solving a rational exponent equation, isolate the variable. Then, to eliminate the exponent, you will need to raise everything to the reciprocal power.
Determine if x = 9 is a solution to .
Solution: Substitute in x and see if the equation holds.
9 is a solution to this equation.
Solution: First, divide both sides by 3 to isolate .
is raised to the five-halves power. To cancel out this exponent, we need to raise everything to the two-fifths power.
Solution: Isolate by subtracting 48 and dividing by -2.
To undo the three-fourths power, raise everything to the four-thirds power.
Intro Problem Revisit We need to plug 156.8 in to the equation for L and solve. If our answer equals , then the given length is correct.
does not equal , so the length cannot be 156.8.
Solve the following rational exponent equations and check for extraneous solutions.
1. Divide both sides by 8 and raise everything to the three-halves power.
2. Here, only the is raised to the three-halves power. Subtract 141 from both sides and divide by 6. Then, eliminate the exponent by raising both sides to the two-thirds power.
Determine if the following values of x are solutions to the equation
Solve the following equations. Round any decimal answers to 2 decimal places.
Answers for Explore More Problems
To view the Explore More answers, open this PDF file and look for section 7.9.