The height of a triangular flower garden is 6 feet more than the length of the base. If the area of the garden is 8 square feet, find the dimensions of the flower garden.

From the text you can derive the following equations:

(1) A = bh/2 = 8

(2) and h = b+6

Fill in h in (1):

b (b+6) / 2 = 8 = > b^2 + 6b = 16 with the quadratic formula or simply trying some values for b you can find b=2, so h=8.