Question

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Answer 1

Use the identity (a+b)^3 = a^3+ b^4 +3ab

Answer 2

It is in the form of (a+b)³=a³+b³+3ab(a+b)

(7+4√3)³=

(7)³ + (4√3)³ + 3*7*4√3(7+4√3)

=343 + 192√3 + 84√3(7+4√3)

=343 +192√3 +588√3 +1008

=1351 + 780√3

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