### Home > CC3 > Chapter 9 > Lesson 9.2.6 > Problem 9-140

9-140.

Use the Pythagorean Theorem.

7^{2} + *x*^{2} = 30^{2}

49 + *x*^{2} = 900

*x*^{2} = 851

9-140.

Use the Pythagorean Theorem.

7^{2} + *x*^{2} = 30^{2}

49 + *x*^{2} = 900

*x*^{2} = 851