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If (g(y)) = \(\frac{y - 3}{11}\) + \(\frac{11}{y^2 - 9}\). what is g(y + 3)?

Mathematics
JAMB 1988

If (g(y)) = \(\frac{y - 3}{11}\) + \(\frac{11}{y^2 - 9}\). what is g(y + 3)?

  • A. \(\frac{y}{11} + \frac{11}{y(y + 6)}\)
  • B. \(\frac{y}{11} + \frac{11}{y(y + 3)}\)
  • C. \(\frac{y + 30}{11} + \frac{11}{y(y + 3)}\)
  • D. \(\frac{y + 3}{11} + \frac{11}{y(y - 6)}\)
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Correct Answer: Option A
Explanation

\(g(y) = \frac{y - 3}{11} + \frac{11}{y^{2} - 9}\)

\(\therefore g(y + 3) = \frac{(y + 3) - 3}{11} + \frac{11}{(y + 3)^{2} - 9}\)

\(g(y + 3) = \frac{y}{11} + \frac{11}{y^{2} + 6y + 9 - 9}\)

\(g(y + 3) = \frac{y}{11} + \frac{11}{y^{2} + 6y}\)

= \(\frac{y}{11} + \frac{11}{y(y + 6)}\)


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