Find the value of 27x^3 - 1/27x^3 , if 3x - 1/3x = 5
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Answered by
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if 3x-1/3x=5
then
(3x-1/3x)³=(3x)³-(1/3x)³-3*3x*1/3x(3x-1/3x)
put value of 3x-1/3x=5
(5)³=27x³-1/27x³-3*5
125=27x³-1/27x³-15
27x³-1/27x³=125+15
27x³-1/27x³=140
plz mark as brainlist answer
then
(3x-1/3x)³=(3x)³-(1/3x)³-3*3x*1/3x(3x-1/3x)
put value of 3x-1/3x=5
(5)³=27x³-1/27x³-3*5
125=27x³-1/27x³-15
27x³-1/27x³=125+15
27x³-1/27x³=140
plz mark as brainlist answer
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