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In the model of a square with side (t−3), what will be the last term?

Answer and explanation

Correct answer: 9

Direct answer: B, 9. A square whose side is t−3 has area (t−3)². Use the identity (p−q)²=p²−2pq+q². Substituting p=t and q=3 gives t²−2(t)(3)+3²=t²−6t+9. The last term is the constant term q², so it is 9. In an area model, this term represents the small square with side 3; its area is 3×3=9, which cannot be negative. A, −9, is wrong because squaring 3 gives a positive result; the minus sign affects the two rectangular middle parts. C, 3t, contains a variable and represents neither the final constant term nor the complete middle contribution. D, −6t, is the middle term formed by combining two products of t and −3. Thus B is the only valid answer. Memory cue: in (a−b)², the final term is always b² and is positive.

Related tags

Square Of DifferenceLast TermArea ModelAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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