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In a visual model, when a square of side b is removed from a square of side a, what is the remaining area called?

Answer and explanation

Correct answer: Difference of squares

Direct answer: C, difference of squares. A square of side a has area a². A smaller square of side b has area b². When the smaller square is removed, subtraction is required, so the remaining area is a²-b². This expression is called the difference of squares. A, square of a sum, refers to (a+b)² and represents a different construction in which lengths are added before squaring. B, a perfect-square trinomial, usually has three terms such as a²-2ab+b² and represents (a-b)², not simply one square area removed from another. D means a²+b², which adds the two areas rather than removing one. The visual action is the key: removed area means subtraction. If needed, the remaining region can also be rearranged to show a²-b²=(a+b)(a-b).

Related tags

Difference Of SquaresVisual RemovalArea IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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