Find All Fixed Points for the Function by Setting the Function

Find all fixed points for the function by setting the function equal to x and solving the resulting equation for x.
-The height of a triangle is 4 centimeters more than the base. If the area of the triangle is 198 square centimeters, find the base and height of the triangle.

A) Base: 14 centimeters; Height: 18 centimeters
B) Base: 18 centimeters; Height: 22 centimeters
C) Base: 17 centimeters; Height: 23 centimeters
D) Base: 17 centimeters; Height: 21 centimeters