Answers

2014-10-13T20:55:32+08:00
Area of a rectangle is A = LW
but L on that case is L=W+3 and A=119
A = LW
119 = (W +3)(W)
119 = W² + 3W
w² + 3W - 119 = 0
using quadratic formula
x =  \frac{-b (+-)  \sqrt{b^2 -4ac} }{2a}
x = 9.51cm, -12.51cm
taking the positive values:
x = 9.51 and 12.51
W=9.51cm
L =12.51cm
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