w(w + 10) = 6864
w2 + 10w - 6864 = 0
w2 + 88w - 78w -6864 = 0
w(w + 88) - 78(w + 88) = 0
(w -78)(w + 88) = 0
w - 78 = 0
w = 78
l = 78 + 10 = 88
w + 88 = 0
w = -88
Length is always positive, so this is out.
Length: 88 ft
Width: 78 ft
Steven K.
I see what he's doing. He is trying to find factors that add up to be 10. It's like an unsimplified foil if you think about it. I didn't quite understand it at first either.
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09/09/19
Sara S.
where did you come up with this? w2 + 88w - 78w -6864 = 009/09/19