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What is the simplified form of ( (3x+4)^2-(3x-4)^2 )?

Answer and explanation

Correct answer: \(48x\)

Use the identity \((a+b)^2-(a-b)^2=4ab\). Here, \(a=3x\) and \(b=4\). Therefore, the expression becomes \(4\times 3x\times 4=48x\). The expression \(9x^2-16\) is the product \((3x+4)(3x-4)\), not the difference of the two squares given here. Exam tip: Recognising the identity is usually faster than expanding both squares.

Related tags

Algebraic IdentitiesDifference Of SquaresPolynomial SimplificationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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