@a_simsim 

Thanks for your responce,

Can you help me to solve it with numerical inversion?

@Kitonum 

Thanks for your response and guidance, i edit that. And forget (m) coefficient.

@vv Thanks for your response.

@Kitonum

Thank you, you are the best. 

@Kitonum Thanks for your response, but you had a mistake! you didn't attention to power 2

@vv Thanks for your response, please explain more.