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If (x−5, x+3, x+11, x+19) is an arithmetic progression, what are the differences of the first two and last two terms?

Answer and explanation

Correct answer: 8 and 8

Find each requested difference by subtracting consecutive terms. For the first two terms, (x+3)−(x−5)=x+3−x+5=8. For the last two terms, (x+19)−(x+11)=x+19−x−11=8. In both calculations, the variable x cancels, leaving the same constant difference. Thus the sequence has common difference 8, and the answer is option A. This also verifies the arithmetic-progression property: every successive difference is 8, including (x+11)−(x+3). Options C and D incorrectly retain x after cancellation, while option B gives two numbers that do not result from either subtraction. The key concept is that algebraic expressions may represent fixed differences even when each individual term contains a variable.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic TermsConsecutive DifferencesIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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