Question

Dose anyone know how to solve this?

Answer 1

Answer:

$f( \frac{5}{x} ) = \frac{4 \times \frac{5}{x} + 3}{6 \times \frac{5}{x} + 2} = \frac{20 + 3x}{30 + 2x} \\ \\ g(x - 3) = \sqrt{(x - 3) {}^{2} - 9(x - 3) } = \sqrt{x { }^{2} - 6x + 9 - 9x + 27 } = \sqrt{x {}^{2} - 15x + 36 }$