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If the outer dimensions of a rectangle model are (x+5) and (x−2), what is the constant corner among the four parts?

Answer and explanation

Correct answer: −10

The direct answer is B: −10. Split the first dimension into x and 5, and the second into x and −2. The constant corner is formed by multiplying the two constant pieces, 5 and −2. Its signed area is 5×(−2)=−10. Expanding confirms this: (x+5)(x−2)=x²−2x+5x−10=x²+3x−10, so the constant term is exactly −10. Option A, 10, ignores the negative sign in −2. Option B correctly preserves the signs of both constant pieces. Option C is the sum of the two constants, not their product. Option D is their difference and also does not represent the corner product. In signed area models, a negative piece is treated algebraically as a subtraction. Memory cue: the constant term always comes from constant × constant, with the signs included.

Related tags

Constant-TermSigned-AreaRectangle-ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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