Q. 4 E4.3( 13 Votes )

# Expand each of the following, using suitable identities(p + 1)3

Using identity (x + y)3 = x3 + y3 + 3x2y + 3xy2

Here x = p and y = 1

(p + 1)3 = p3 + 13 + 3(p)2(1) + 3(p)(1)2

= p3 + 13 + 3p2 + 3p

Therefore (p + 1)3 = p3 + 13 + 3p2 + 3p

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