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If the terms (5, 5+d, 5+2d) become (5, -1, -7), what is d?

Answer and explanation

Correct answer: -6

The expression (5, 5+d, 5+2d) represents three consecutive terms of an arithmetic progression whose first term is 5 and common difference is d. Match the second general term with the second given term: 5+d=-1. Subtracting 5 from both sides gives d=-1-5=-6. We can verify the result using the third term: 5+2d=5+2(-6)=5-12=-7, exactly as required. Therefore option B is correct. Option A has the wrong sign, usually caused by reversing the subtraction. Option C is the magnitude of the change from 5 to -7, but it ignores the fact that two equal steps occur. Option D incorrectly doubles the common difference.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic FormIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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