Question

e) Expanded form of (2x + 1)2 equals to
A) 4x2 + 6x3 + 3x + 2 B) 8x3 + 16x2 + 6x + 1
C) 8x3 + 12x2 + 6x + 1 D) 4x3 + 12x2 + 6x + 1
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Answer 1

Answer:

(2x+1)²= by using identity a+b² = a²+b²+2ab

here a=2x, b=1

(2x)²+1²+2×2x×1

4x²+1+4x