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a piece of cardboard has an area of 486 cm^2. a square of side 3cm is cut from each corner and an open box is made by turning up the ends and sides if the volume of the box formed is 756cm^3. what are the dimensions of the cardboard?

Mathematics
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drawing a figure will help, could u draw a figure of this ?
|dw:1353637103770:dw|
|dw:1353579949506:dw|

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Other answers:

volume = 3(x-6)(y-6) = 756
can u solve those 2 equations ? xy=486 3(x-6)(y-6) = 756 ?
cAN I DO the substitution method?
x = 486/y then substitute to the second equation
try it, if u go wrong, i'll help.... instead substitute xy=486 in 2nd equation
u get xy term in 2nd equation
and u'll be able to find x+y from 2nd equation...
18y^2-810y+8748 very big numbers >.<
y^2-45y+486
if 18y^2-810y+8748 is correct... i have not checked that.
y^2-45y+486 =0 is correct can u factor it ?
hint : 18*27 = 486
y^2-45y+486 =0 (y-18)(y-27)=0
find y from here, then u also get 2 values of x then dimensions are x,y
you're a very big help to me my friend. thanks a lot :)

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