### Home > PC > Chapter 10 > Lesson 10.1.1 > Problem 10-9

10-9.

Solve this equation using the same steps as you would to solve the equation

7*x* − 9 = 2*x* − 7.

How do you 'undo' the sine function?

You will need to use the sin^{−1} key on your calculator.Remeber that your calculator will only give one answer.

*x* = 0.412

Draw a unit cirlce to find the 2nd answer. Recall that *π* ≈ 3.14.

Solve this equation using the same steps as you wold to solve the equation

4*x*² = 3.

Don't forget the ± sign.

You do not need your calculator and should find 4 solutions.