Find the value of a3+b3,if a-b=15,ab=20
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a3-b3=(a-b) (a2+ab+b2)
(a-b) (a2-2ab+b2+2ab+ab)
adding and subtracting 2ab in second bracket
(a-b) ((a-b) ²+3ab)
15*((15)²+3*20
15*(225+60)
15*285
4275 answer
(a-b) (a2-2ab+b2+2ab+ab)
adding and subtracting 2ab in second bracket
(a-b) ((a-b) ²+3ab)
15*((15)²+3*20
15*(225+60)
15*285
4275 answer
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