Question

AC^2=AB^2+BC^2= x^2 =15^2+8^2

Answer 1

Answer:

AC² = AB² + BC²

=> x² = 15² + 8²

=> x² = 225 + 64

=> x² = 289

=> x = √ 289 = + 17 or - 17.

This theorem used here is called Pythagoras Theorem and is used for determining sides of a right angle triangle.

If that is the case, then the side cannot be negative. Hence +17 will be the answer.