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A visual model shows (9a^2+24a+16) as a perfect square. What will its side be?

Answer and explanation

Correct answer: 3a+4

The direct answer is A, 3a+4. Recognise the first term as (3a)^2 and the last term as 4^2. For a perfect-square expression, the middle term must be twice the product of these parts: 2(3a)(4)=24a. Therefore 9a^2+24a+16=(3a+4)^2, so the visual square has side 3a+4. B and D use 9a as though it were the side, but 9a^2 has square root 3a, not 9a. C gives a side whose cross-term would be 2(3a)(8)=48a, so it cannot match 24a. The side is obtained by taking the square roots of the two corner square areas and combining them with the sign of the middle term. Memory cue: check first square, last square, then twice the product.

Related tags

Perfect SquareBinomial SquareArea ModelAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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