If 2a + 3b=15 and ab=10,find 8a cube and 27b cube
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2a+3b=15
Cubing both sides
(2a+3b)^3=(15)^3
8a^3+27b^3+3ab (a+b)= 3375
8a^3+27b^3+3 (10)(a+b)=3375
8a^3+27b^3+30 (a+b)=3375
8a^3+27b^3=3375-30 (a+b)
Cubing both sides
(2a+3b)^3=(15)^3
8a^3+27b^3+3ab (a+b)= 3375
8a^3+27b^3+3 (10)(a+b)=3375
8a^3+27b^3+30 (a+b)=3375
8a^3+27b^3=3375-30 (a+b)
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