The length of a rectangle is
So L = 11 + 2W, right
A= 63 m^2
Substitute L so you have just W's
(11+2W)(W) = 63
solve for W. Using a graphing calculator with the above eqn.:
the positive value for W is 3.5. you can plug this back in to check.
if W=3.5, then L*W=A goes to L*(3.5)=63
divide both sides by 3.5
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