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Class 9MathematicsExploring Algebraic IdentitiesVisual models of identitiesMediumLevel 67
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If a square of side (a-b) has final area (a^2-2ab+b^2) then why does the (+b^2) part appear?

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Answer and explanation

Correct answer: Because the corner (b^2) part is subtracted twice and added once

When two strips are removed the corner is removed twice so it must be added back. Exam tip: treat (+b^2) as a correction term.

Related tags

Correction TermMinus SquareVisual Model

Frequently asked questions

What is the correct answer to this question?

Because the corner (b^2) part is subtracted twice and added once

Why is this the correct answer?

When two strips are removed the corner is removed twice so it must be added back. Exam tip: treat (+b^2) as a correction term.

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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