Question

If a=4.965, b=2.343 and c=2.622, then the value of a³-b³-c³-3abc is : *

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Answer 1

Answer:

now take a=5 b=2 and c=3 , so a³+(-b³)+(-c³) -3abc =0

now there's one formula that if a+b+c=0 then a³+b³+c³=3abc

so, as you can see that 5-3-2= 5-5=0 , so 3×5×(-3)×(-2)= 15×6=90

and your answer equals to

90-90=0

so the answer is 0.

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