The side of a square is $(2x + 5)$ cm. Its area is

The side of a square is $(2x + 5)$ cm. Its area is
  1. $4x^{2} + 20x + 25$ sq.cm
  2. $4x^{2} + 25$ sq.cm
  3. $4x^{2} + 10x + 25$ sq.cm
  4. $2x^{2} + 20x + 25$ sq.cm

Solution

Area = (side)$^{2}$ = $(2x+5)^{2} = 4x^{2} + 20x + 25$.

Asked in: IMO

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