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In a visual model, (x + 2)² is subtracted from (x + 6)². What is the remaining area equal to?

Answer and explanation

Correct answer: 8x + 32

The direct answer is D: the remaining area is 8x + 32. The difference of two square areas is (x + 6)² − (x + 2)². Use the identity p² − q² = (p + q)(p − q), taking p = x + 6 and q = x + 2. Then the difference is [(x + 6) + (x + 2)] [(x + 6) − (x + 2)] = (2x + 8)(4) = 8x + 32. A, 4x + 16, is only half the correct result and does not use the full side difference. B, 4x + 32, has an incorrect x-coefficient. C, 8x + 16, has the wrong constant term. D correctly represents the total border-like area between the two squares. As a check, direct expansion gives x² + 12x + 36 − (x² + 4x + 4) = 8x + 32. Memory cue: difference of squares equals sum times difference.

Related tags

Visual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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