Posted by jackie on Thursday, September 2, 2010 at 1:07pm.
The base of a triangle is 3cm grater than the height. The area is 14cm^2. Find the height and length of the base. Please show how you dervied at your answer.

algebra  Henry, Thursday, September 2, 2010 at 10:24pm
h = xcm
b = (x + 3) cm
A = 14 cm^2
A = h * b / 2,
x(x + 3) / 2 = 14cm^2
Multiply both sides by 2:,
x(x + 3) = 28,
x^2 + 3x = 28,
x^2 + 3x  28 = 0,
Factor the trinomial:
(x  4) (x + 7) = 0,
x + 7 = 0, x =  7;
x  4 = 0 , x = 4 cm = h,
x + 3 = 4 + 3 = 7 cm = b
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