Find the value of 8a^3-27b^3+90ab+125.if 2a=3b-5
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this equation can be written as
(2a)^3(-3b)^3+(5)^3-3×2a×(-3b)×5
this is the formula of
(a+b+c)^3
here
a=2a
b=-3b
c=5
putting these values in the equation
(2a-3b+5)^3
we have
2a=3b-5
putting this in the equation
3b-5-3b+5
that is 0
hence the answer is 0
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