a+b = 10 and ab = 21 then value of a3 +b3
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Answered by
4
(a+b)³=a³+b³+3ab(a+b)
(10)³=a³+b³+3(21)(10)
1000=a³+b³+630
a³+b³=370
Please mark it as a brainliest answer
(10)³=a³+b³+3(21)(10)
1000=a³+b³+630
a³+b³=370
Please mark it as a brainliest answer
abhishek67414:
tq
wlcm
Answered by
1
(A+B)2=a2+b2+2ab
(10)2=a2+b2+2*21
100-42=a2+b2
A2+B2=58.............. ( 1 )
A3+B3=(a+b)( a2-ab+b2)
A3+B3=(10) (a2+b2-21)
A3+B3=10(58-21 )
A3+B3=10*37
A3+B3=370
* is sign of multiple
(10)2=a2+b2+2*21
100-42=a2+b2
A2+B2=58.............. ( 1 )
A3+B3=(a+b)( a2-ab+b2)
A3+B3=(10) (a2+b2-21)
A3+B3=10(58-21 )
A3+B3=10*37
A3+B3=370
* is sign of multiple
nyc
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