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In a rectangle model with sides (x-2) and (x+6), what is the constant part of the product?

Answer and explanation

Correct answer: -12

The direct answer is B: -12. In an algebraic product, the constant term is obtained by multiplying the terms that contain no variable. The two factors are (x-2) and (x+6). Their constant parts are -2 and +6, so their product is (-2)(6)=-12. To check completely, distribute each term: x·x=x², x·6=6x, (-2)·x=-2x, and (-2)·6=-12. Combining the middle terms gives x²+4x-12, so the constant term is -12. Option A, 12, incorrectly ignores the negative sign in -2. Option C, 4, is the coefficient of x after combining 6x and -2x, not the constant term. Option D, -4, does not result from multiplying the constant parts. Memory cue: constant times constant gives the constant term; always carry the signs.

Related tags

Constant TermRectangle ModelDistributive PropertySign RulesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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