If a+b=15 and ab=56 then find
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A+b=15
Squaring on both sides
A+b²=15²
A²+b²+2ab=225
(A²+b²) =225-2*56
(A²+b²) =225-112
(A²+b²) =113
First answer is come
Now find a³+b³
Cubing both sides
(A+b) ³=15³
A³+b³+3ab(a+b) =3375
A³+b³+3*56(15)=3375
(A³+b³) =3375-3*56*15
(A³+b³) =3375-2520
(A³+b³) =855
I hope this will help you
By Devansh
Squaring on both sides
A+b²=15²
A²+b²+2ab=225
(A²+b²) =225-2*56
(A²+b²) =225-112
(A²+b²) =113
First answer is come
Now find a³+b³
Cubing both sides
(A+b) ³=15³
A³+b³+3ab(a+b) =3375
A³+b³+3*56(15)=3375
(A³+b³) =3375-3*56*15
(A³+b³) =3375-2520
(A³+b³) =855
I hope this will help you
By Devansh
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