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A square model has corner parts x^2 and 25. What should the total middle term be to make a perfect square?

Answer and explanation

Correct answer: 10x

The correct answer is B: 10x. The corner regions are squares with areas x^2 and 25. Their side lengths are x and 5, because x^2 = x × x and 25 = 5 × 5. A square with side x + 5 has area (x + 5)^2 = x^2 + 2(x)(5) + 25 = x^2 + 10x + 25. In a visual model, the middle consists of two equal rectangles. Each rectangle has dimensions x and 5, so each has area 5x; together they have area 5x + 5x = 10x. Option A gives only one rectangle, not both. Option B is the complete middle term. Option C incorrectly uses 25 rather than its side 5. Option D doubles the required total again. A useful method is: take the square roots of the two corner areas and double their product. The identity is A^2 + 2AB + B^2.

Related tags

Perfect SquareVisual ModelMiddle TermArea TilesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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