1.

\(\frac{x^2 - 3x - 28}{x^2 - 49} = \frac 3{17} , \; x \ne \pm 7\)

Answer»

\(\frac{x^2 - 3x - 28}{x^2 - 49} = \frac 3{17} , \; x \ne \pm 7\)

⇒ \(17x^2 - 51x - 476 = 3x^2 - 147\)

⇒ \(14x^2 - 51x - 329 = 0\)

⇒ \(x = \frac{51 \pm \sqrt{2601 + 18424}}{28}\)

\(= \frac{51\pm \sqrt {21025}}{28}\)

\(= \frac{51\pm 145}{28}\)

\(= \frac {196}{28} \; or\; \frac{-94}{28}\)

\(= 7 \; or\; \frac{-47}{14}\)

\(\because x \ne 7\)

\(\therefore x = \frac{-47}{14}\)



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