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If x²+4x+4 is made using square tiles, what will be the outer side?

Answer and explanation

Correct answer: x+2

The correct answer is B: x+2. The expression x²+4x+4 is a perfect-square trinomial. Since 4=2², the small constant square has side 2. The two mixed rectangles each have area 2x, so together they contribute 4x. Therefore the tiles fit together as an outer square whose side is x+2: (x+2)²=x²+4x+4. Option A would give (x+4)²=x²+8x+16, which is too large. Option C would give (x−2)²=x²−4x+4, so the middle sign would be wrong. Option D would give (2x+2)²=4x²+8x+4, so even the leading term is incorrect. A useful method is to take the square root of the constant term and then check whether twice that number times x gives the middle term. Here 2×2×x=4x.

Related tags

Algebra TilesPerfect Square TrinomialComplete SquareVisual ModelExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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