Question

please give me the answer as soon as possible!​

Answer 1

1) (k+4) 3=k 3 +4 3 +3.k.4(k+4)⇒(k+4)

3=k3 +12k

2 +48k+64

.

.

.

2) 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

.

.