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In the square area model of (u+v+w)^2, what is the total area of all the mixed rectangles?

Answer and explanation

Correct answer: 2uv+2vw+2wu

Correct answer: C, 2uv+2vw+2wu. Divide each side of the large square into lengths u, v, and w. The three same-term regions are squares with areas u^2, v^2, and w^2; these are not mixed rectangles. For the pair u and v, the model contains two rectangles, with areas uv and vu, together giving 2uv. Similarly, the pair v and w gives 2vw, and the pair w and u gives 2wu. Adding all mixed regions gives 2uv+2vw+2wu. Option A counts each pair only once and therefore gives half the mixed area. Option B contains only the three square regions. Option D has three factors and does not represent a rectangle area from this square model. Remember: every unlike pair occurs in two orientations.

Related tags

Three-Term SquareMixed RectanglesArea ModelAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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