Question

without actually calculating the cubes find the value of each of each of the following first bracket in bracket - 12 Cube + 7 Cube + 5cube

Answer 1

hey friend
here is your answer

according to the formula a^3 + b^3 + c^3 = 3abc
if a + b + c = 0
3abc will be the sum of the cubes 
but ( -12 + 7 + 5 ) = 0 
so we can apply the formula a^3 + b^3 +c^3 = 3abc
3*-12*7*5 = -1260 
hope it helped you
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