Question

Find the value of x. I need help I don’t understand how to do this.

Answer 1

x = 12.

Explanation:

This is a right angled triangle so you use the Pythagoras Theorem:

15^2 = 9^2 + x^2

x^2 = 15^2 - 9^2

x^2 = 225 - 81

x^2 = 144

x = √144

x = 12.