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If \((x+8)^2-(x-8)^2\) is viewed as the visual difference of two squares, what is the result?

Answer and explanation

Correct answer: \(32x\)

Direct answer: B, \(32x\), is correct. Expand the first square: \((x+8)^2=x^2+16x+64\). Expand the second: \((x-8)^2=x^2-16x+64\). Now subtract the entire second expression: \((x^2+16x+64)-(x^2-16x+64)\). The \(x^2\) terms cancel, and the constant 64 terms also cancel. The remaining terms are \(16x+16x=32x\). A is only one of the two linear contributions. C is not the result of this subtraction and leaves an incorrect combination of terms. D incorrectly treats the constants as if they produced a factor of x. A faster check uses the difference-of-squares identity: \(u^2-v^2=(u-v)(u+v)\), giving \((16)(2x)=32x\).

Related tags

Difference Of SquaresVisual DifferenceAlgebraic IdentitiesExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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