if a cube plus b cube is equal to 9 and a + b is equal to 3 find a and b
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Answer:
Your ans
given:-
a+b=9
Ab=20
to find:-
a3+b3
use formula:-
(a+b)3=a3+b3+3ab(a+b)
(9)3=a3+b3+3×20(9)
729=a3+b3+540
189=a3+b3