find the volume of a cuboid with dimensions 5(3-m),2(x-6),5x(7-n)
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length of cuboid=5(3-m)
breadth of cuboid=2(x-6)
height of cuboid=5x(7-n)
volume of cuboid= length×breadth×height
=[5(3-m)]×[2(x-6)]×[5x(7-n)]
=(15-5m)(2x-12)(35-5n)
=[15(2x-12)-5m(2x-12)](35-5n)
= (30x-180-10mx+60 )(35-5n)
=(30x-180-10mx+60)(35)+(30x-180-10mx+60)(-5n)
= 1050x-6300-350mx+2100-150xn+900n+50mxn-300n
=1050x-4200-350mx-150xn+600n+50mxn
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