If 5a-3b = 1 ,ab = 6 then find the value of 125a³-27b³.
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we need to apply the formula
(a -b)³ = a³ - b³ -3ab(a - b)
(5a -3b)=125a³ - 27b³ -3ab(5a-5b)
apply the givens
(1)³ = 125a³ - 27b³ -3×6(1)
1=125a³ - 27b³ -18
125a³ -27b³ =19
hope it help you
thanks
(a -b)³ = a³ - b³ -3ab(a - b)
(5a -3b)=125a³ - 27b³ -3ab(5a-5b)
apply the givens
(1)³ = 125a³ - 27b³ -3×6(1)
1=125a³ - 27b³ -18
125a³ -27b³ =19
hope it help you
thanks
ranavikrama135:
Thanks
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