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In the rectangle model formed by (3m+7) and (3m−7), which term will not remain?

Answer and explanation

Correct answer: Linear term in m

The direct answer is C: the linear term in m will not remain. Multiply the side expressions: (3m+7)(3m−7). Using (u+v)(u−v)=u²−v², with u=3m and v=7, the result is (3m)²−7²=9m²−49. If the rectangle is split into parts, the cross-products are 21m and −21m. They have equal magnitude and opposite signs, so their sum is zero. Thus the m-term cancels. Option A, 9m², remains as the product of the variable parts. Option B, −49, remains as the constant product 7×(−7). Option D is a category: the constant term does remain, specifically −49. Memory cue: conjugate factors remove the middle term.

Related tags

Difference Of SquaresTerm CancellationRectangle ModelAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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