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A visual square has a 4x² part, two equal strips with total area 28x, and a 49 corner. What is the side of the square?

Answer and explanation

Correct answer: 2x+7

The correct answer is A: 2x+7. The large part has area 4x², so its side is 2x because (2x)²=4x². The corner has area 49, so its side is 7 because 7²=49. The two equal strips together have area 2×(2x×7)=28x, which agrees with the information in the question. Therefore the full side is 2x+7. Option B uses 4x as though it were the side of the first square, but its square would be 16x². Option C combines unlike quantities incorrectly, and option D would give only x² for the large part. The reliable check is (2x+7)²=4x²+28x+49.

Related tags

Visual-SquareError-CheckPerfect-SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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