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In a square of side x+y, the sum of the x² and y² parts is 50 and the total area of the two rectangles is 48. What is the area of the whole square?

Answer and explanation

Correct answer: 98

Direct answer: Option C, 98, is correct. Divide the square of side x+y into one x by x square, one y by y square, and two x by y rectangles. The two square regions together have area x²+y²=50. The two rectangular regions together have area 2xy=48. The entire square is made from all four non-overlapping regions, so its area is 50+48=98. Equivalently, (x+y)²=x²+2xy+y². Option A, 2, is just the number of rectangular pieces and is not an area. Option B counts only the rectangles and omits the square pieces. Option D multiplies 50 and 48, even though the regions must be added to obtain the total area. The important idea is that a partitioned figure’s total area equals the sum of the areas of all its parts.

Related tags

Area AdditionVisual SquareBinomial IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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