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eroshea
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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?
 2 years ago
 2 years ago
eroshea Group Title
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?
 2 years ago
 2 years ago

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hartnn Group TitleBest ResponseYou've already chosen the best response.1
drawing a figure will help, could u draw a figure of this ?
 2 years ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
dw:1353637103770:dw
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
dw:1353579949506:dw
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
volume = 3(x6)(y6) = 756
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
can u solve those 2 equations ? xy=486 3(x6)(y6) = 756 ?
 2 years ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
cAN I DO the substitution method?
 2 years ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
x = 486/y then substitute to the second equation
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
try it, if u go wrong, i'll help.... instead substitute xy=486 in 2nd equation
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
u get xy term in 2nd equation
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
and u'll be able to find x+y from 2nd equation...
 2 years ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
18y^2810y+8748 very big numbers >.<
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
if 18y^2810y+8748 is correct... i have not checked that.
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
y^245y+486 =0 is correct can u factor it ?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
hint : 18*27 = 486
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
y^245y+486 =0 (y18)(y27)=0
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
find y from here, then u also get 2 values of x then dimensions are x,y
 2 years ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
you're a very big help to me my friend. thanks a lot :)
 2 years ago
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