Question

a+b=8,ab=6,find a³+b³.

Answer 1

a+b=8 and ab=6 now accoding to the formula,
a³+b³=(a+b)³-3ab(a+b)
by adding values,
a³+b³=(8)³-3(6)(8)
       =512-144
       =368
therefore, a³+b³=368

Answer 2

a+b=8 and ab=6

a³+b³=(a+b)³-3ab(a+b)
       =8³-3×6(8)
       =512-144
       =368