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A square model shows (16p^2-24p+9). It is equal to which square?

Answer and explanation

Correct answer: (4p-3)^2

The direct answer is C. Recognize the first and last terms as squares: 16p^2=(4p)^2 and 9=3^2. The negative middle term shows that the two parts are subtracted. Applying (u-v)^2=u^2-2uv+v^2 with u=4p and v=3 gives (4p-3)^2=(4p)^2-2(4p)(3)+3^2=16p^2-24p+9. A uses addition, so its middle term would be +24p. B squares 16p rather than 4p and would produce 256p^2-96p+9. D has first term p^2, not 16p^2, and therefore cannot match. The sign and square roots of the first and last terms are enough to identify the correct binomial, but checking the middle term confirms it. Memory cue: a perfect square with a negative middle term has the form (first square root minus last square root)^2.

Related tags

Perfect SquareQuadratic IdentityVisual ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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