Qualification > Sciences
Maths & Physics Help
sonali:
hey this is seriosly tough
plzz crack this fr me
plzz give full details oh hw to get to d ans
q. when each edge of a cube is decreased by 1cm, its volume is decreased by 91cm^3 (i mean 91cm cube). find the lenghth of d side of d original cube.
u hv to form eq n solve this
astarmathsandphysics:
orig volume=x^3
new volume=(x-1)^3=x^3-3x^2+3x-1
equation is x^3-(x^3-3x^2+3x-1)=91
ie 3x^2-3x+1=91
3x^2-3x-90=0
x^2-x-30=0
(x-6)(x+5)=0
x=6 or -5
but it must be 6 since x must be positive.
badboy:
yoo pipo am duin maths paper 2 extended on 5th november can any 1 help with questions of maths n also chemistry and physics
astarmathsandphysics:
post questions here and i will help. for some to do goto www.freexampapers.com
badboy:
yo astarinmaths n physics cum onlin ive added u in msn hotmail
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