(c - 9)/(√c + 3) - √c

[latex][latex] \frac{c-9}{ \sqrt{c} +3} - \sqrt{c} = \frac{c-9- \sqrt{c}( \sqrt{c} +3) }{ \sqrt{c} +3} = \frac{-3 \sqrt{c} -9}{ \sqrt{c}+3 } = \frac{-3( \sqrt{c}+3) }{ \sqrt{c}+3 } = -{3} [/latex] 

Задание решено......