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Class 9MathematicsExploring Algebraic IdentitiesVisual models of identitiesHardLevel 67
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In the rectangle model of ((x+2y)(x-2y)), what happens to the middle rectangular terms?

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Answer and explanation

Correct answer: They become (2xy) and (-2xy) and cancel

One rectangle is (2xy) and the other is (-2xy), so the middle terms cancel. Exam tip: identify cancellation in conjugate products.

Related tags

Conjugate-ProductVisual-CancellationArea-Model

Frequently asked questions

What is the correct answer to this question?

They become (2xy) and (-2xy) and cancel

Why is this the correct answer?

One rectangle is (2xy) and the other is (-2xy), so the middle terms cancel. Exam tip: identify cancellation in conjugate products.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Exploring Algebraic Identities. Topic: Visual models of identities.

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10 more MCQs
  1. 1A square has side \(a+b\). Which identity is shown by its area model?
  2. 2A diagram has two small squares with sides \(a\) and \(b\) and two equal rectangles. What is the total area?
  3. 3If the side of a big square is \(x+3\), how will its area be written?
  4. 4A square has side \(a\). A corner square of \(b \times b\) is removed. The remaining area is related to which expression?
  5. 5In a visual model \(a^2-b^2\) is rearranged into two rectangles. Which factorisation does it show?
  6. 6What is the area of a square with side \(a-b\)?
  7. 7In a diagram two \(a \times b\) rectangles are subtracted from a big \(a \times a\) square and a \(b \times b\) square is added back. Which identity is formed?
  8. 8What is the area of a rectangle with length \(x+2\) and breadth \(x+5\) in visual form?
  9. 9In a tile model there is one \(x^2\) tile and \(8\) \(x\)-tiles. If there are \(16\) constant tiles then the complete square models what?
  10. 10If in a square model the total area of the two middle rectangles is \(10x\) and the small square area is \(25\), what is the side?
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