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A visual model shows a square of side (p+3). Which expansion is formed by its corner square and strips?

Answer and explanation

Correct answer: p²+6p+9

The direct answer is B: (p+3)²=p²+6p+9. Split the square into a p-by-p square of area p², two strips each measuring p by 3 and therefore having area 3p, and a 3-by-3 corner square of area 9. Add all parts: p²+3p+3p+9=p²+6p+9. A counts only one strip, so its middle term is too small. C invents 9p, which is neither the area of one strip nor the corner. D uses 3 instead of the corner area 9. The identity (u+v)²=u²+2uv+v² explains the same result: u=p and v=3. Memory cue: the middle term comes from two identical strips.

Related tags

Visual AlgebraSquare ModelExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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