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In a diagram, two \(ab\) rectangles are added with \(a^2\) and \(b^2\) squares. What will be the total area?

Answer and explanation

Correct answer: \(a^2+2ab+b^2\)

The direct answer is option C. Add the area of every separate region in the diagram: the first square contributes \(a^2\), each of the two rectangles contributes \(ab\), and the second square contributes \(b^2\). Thus the total is \(a^2+ab+ab+b^2=a^2+2ab+b^2\). This is also the identity \((a+b)^2\), because the four regions can form a square with side \(a+b\). Option A omits both rectangular regions. Option B subtracts one rectangle even though all listed regions are being added. Option D subtracts both rectangles and represents \((a-b)^2\), not this diagram. A reliable method is to write each small area separately before combining like terms.

Related tags

Algebraic IdentitiesVisual AreaBinomial SquareArea AdditionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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