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A square model has parts u², 10u, and 25. It is the square of which side?

Answer and explanation

Correct answer: u+5

The correct answer is C: u+5. The total area is u²+10u+25. The first term u² indicates a square with side u. The last term 25 is 5², so the small corner square has side 5. The two mixed rectangles should then have total area 2×u×5=10u, exactly matching the middle part. Hence the complete square has side u+5, and (u+5)²=u²+10u+25. Option A treats 10 as a side even though it is not the square root of the constant area. Option B similarly uses 25 instead of its square root. Option D would produce (u−5)²=u²−10u+25, with the wrong sign for the middle term. Memory cue: for a²+2ab+b², identify a from the first term and b from the last term, then verify the middle term.

Related tags

Perfect Square TrinomialArea ModelVisual IdentitiesBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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