Question Number 16918 by rustylee last updated on 28/Jun/17
$$\mathrm{2}{x}\mathrm{2}+\mathrm{9}{x}=\mathrm{10} \\ $$
Answered by Joel577 last updated on 28/Jun/17
$$\mathrm{2}{x}^{\mathrm{2}} \:+\:\mathrm{9}{x}\:−\:\mathrm{10}\:=\:\mathrm{0} \\ $$$${x}_{\mathrm{1},\mathrm{2}} \:=\:\frac{−\mathrm{9}\:\pm\:\sqrt{\mathrm{81}\:+\:\mathrm{80}}}{\mathrm{4}} \\ $$$$\:\:\:\:\:\:\:\:=\:\frac{−\mathrm{9}\:\pm\:\sqrt{\mathrm{161}}}{\mathrm{4}} \\ $$