Answer :

(7x + 8y)3 =(7x)3 + [ 3 ×(7x)2 ×(8y)] + [ 3 ×(7x)×(8y)2 ] + (8y)3


{ (a + b)3 = a3 + 3a2b + 3ab2 + b3 }


= 343x3 +(3 × 49 × 8)x2y +(3 × 7 × 64)xy2 + 512y3


=343x3 + 1176x2y + 1344xy2 + 512y3


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