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If the side of a large square is (p+5), what is its total area?

Answer and explanation

Correct answer: p²+10p+25

The correct answer is D: p²+10p+25. A square’s area is the square of its side, so the area is (p+5)². Use (u+v)²=u²+2uv+v² with u=p and v=5. This gives p²+2(p)(5)+5²=p²+10p+25. In the visual model, p² is the large p-by-p square, 5p and 5p are the two equal rectangles, and 25 is the small 5-by-5 square. Option A includes only one 5p rectangle, so it is incomplete. Option B has the correct p² and 10p but gives the wrong constant term, because 5²=25, not 5. Option C places the numbers with the wrong terms and does not follow the identity. Therefore D is correct. A quick check is to substitute p=1: the actual area is 6²=36, and D gives 1+10+25=36.

Related tags

Square ExpansionVisual ModelPerfect-Square IdentityAreaVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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