CPM Homework Help : GC Problem 4-47

A right triangle with a base of 10, height of x + 3, and hypotenuse of 26. Find the value of $x$ in the triangle at right. Refer to problem 4-8 for help. Show all work.

Hint:

Use the Pythagorean Theorem.

Reminder:

$(x+3)^2=(x+3)(x+3)$

Answer:

$x=21$