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What is the simplified form of \((x+7)(x-7)\)?

Answer and explanation

Correct answer: x² − 49

The expression uses the difference-of-squares identity \((a+b)(a-b)=a²-b²\). Here, \(a=x
u0000\) and \(b=7
u0000\), so \((x+7)(x-7)=x²-7²=x²-49
u0000\). Option B has the wrong sign, while options C and D do not result from multiplying these conjugate binomials. In an exam, identify \((a+b)(a-b)\) directly as \(a²-b²\).

Related tags

PolynomialsAlgebraic IdentitiesDifference Of SquaresBinomial MultiplicationOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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