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If a square model has corner squares x² and 64, what combined middle term is needed to form a perfect square?

Answer and explanation

Correct answer: 8x + 8x = 16x

The direct answer is option B: 16x. A square model with corner areas x² and 64 has side lengths x and 8, because 64 = 8². When these two lengths form the sides of a larger square, the two middle rectangular regions each have area x × 8 = 8x. The combined middle area is therefore 8x + 8x = 16x. Algebraically, this is the identity (x + 8)² = x² + 16x + 64. Option A gives only one of the two rectangles, not their combined area. Option C doubles 16x again and is too large. Option D treats 64 as the middle term instead of as the corner square. Remember: the middle coefficient in (p + q)² is 2pq; first take the square root of 64 to obtain 8, then calculate 2 × x × 8.

Related tags

Complete SquareVisual Area ModelMissing Middle TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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