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In an area model, x² + 6x has to be made into a perfect square. What is the area of the small empty corner?

Answer and explanation

Correct answer: 9

Direct answer: Option B, 9, is correct. The term 6x can be represented by two equal rectangles, each with area 3x. One side of each rectangle is x, so the other side is 3. When these pieces are arranged around the x² square, a small corner remains empty. That corner is a square with side 3, so its area is 3² = 9. Algebraically, x² + 6x + 9 = x² + 2(x)(3) + 3² = (x + 3)². Option A is the full coefficient of x, not the missing corner area. Option C doubles the required corner area. Option D squares 6 instead of half of 6. Memory cue: to complete x² + bx, take half of b and square it: (b/2)².

Related tags

Completing SquareMissing CornerArea ModelPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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