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For what value will the common differences of (2x+5, 4x+1, 7x-7) be equal?

Answer and explanation

Correct answer: 4

For the three terms to form an AP, their consecutive differences must be equal. The first difference is \((4x+1)-(2x+5)=2x-4\), and the second difference is \((7x-7)-(4x+1)=3x-8\). Equating them, \(2x-4=3x-8\), gives \(x=4\). Option 3 is a close distractor, but it does not make the two differences equal. Exam tip: For three algebraic terms in an AP, calculate the second-minus-first and third-minus-second differences before equating them.

Related tags

Arithmetic ProgressionCommon DifferenceLinear EquationsClass 10 MathematicsAp TermsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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