maths
posted by jke on .
the length of a rectangle is 2 centimetres less than twice the width. the area of the rectangle is 180 square centimetres. find the length and width of the rectangle.

L W = 180
2W L = 2
Solve for L and W
(2W 2)*W 180 = 0
2W^2 2W 180 = 0
This is a factorabble quadratic equation.
(W^2 W 90) = 0
(W 10)(W+9) = 0
W = 10 cm. Ignore the negative root (9)
L = 180/W = 18