Need help quick

Question

The area of a triangle is 80 in². The height is 5 inches less than the base. Find the length of the base rounded to the nearest tenth.

The base is about Blank inches.

Answer 1

b=5+h, h=b-5

80=bh/2

160=bh = b(b-5) = b^2 -5b

b^2 -5b -160 = 0

b = 5/2 + (1/2)sqr(25+640) = slightly less than 15.4 inches for the base

h=10.4 = height

Area = 80 = 15.4(10.4)/2 = 80.08