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A square model x^2-10x+q shows a perfect square. If each removed strip has area 5x, what is q?

Answer and explanation

Correct answer: 25

The correct answer is C. A subtraction square has the form (x-a)^2=x^2-2ax+a^2. Here the total negative middle term is -10x, so 2a=10 and a=5. The two removed strips each have area 5x, consistent with this width. When the two strips are removed, their overlap or missing corner must be restored by a small square of side 5. Its area is 5 times 5=25, so q=25 and the expression is (x-5)^2. A is only the strip width, not its area. B is the total coefficient of the two strips. D incorrectly doubles the required corner area. Memory cue: in x^2-2ax+a^2, the last term is the square of the half-coefficient.

Related tags

Subtraction-SquareOverlap-CorrectionPerfect-SquareVisual-IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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