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In a tile model, (x^2+6x+9) and (x^2+8x+16) are two separate perfect squares. By how much is the side of the first square less than the second?

Answer and explanation

Correct answer: 1

Direct answer: Option A, 1. A perfect-square expression has the form (x+a)²=x²+2ax+a². For the first expression, x²+6x+9=x²+2·x·3+3²=(x+3)², so its square has side x+3. For the second expression, x²+8x+16=x²+2·x·4+4²=(x+4)², so its side is x+4. The second side minus the first side is (x+4)−(x+3)=1. Option A is correct. Option B, 2, wrongly compares the coefficients 6 and 8 directly. Option C, 3, is the small constant in the first factor, not the difference of the sides. Option D, 4, is the small constant in the second factor. Remember: factor each perfect square first; compare side expressions, not their areas or middle coefficients.

Related tags

Perfect SquaresSide ComparisonVisual AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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