Resol u^2(m_{b})=sqrt{028^2+282^2}=283(g)

$$u ^ { 2 } ( m _ { b } ) = \sqrt { 028 ^ { 2 } + 282 ^ { 2 } } = 283 ( g )$$

Calcula (complex solution)

$$m_{b}u^{2}=282\text{ and }g=\frac{282}{283}$$

Resoleu u

$$u=-\sqrt{\frac{282}{m_{b}}}$$

$$u=\sqrt{\frac{282}{m_{b}}}\text{, }m_{b}>0\text{ and }g=\frac{282}{283}$$

Resoleu m_b

$$m_{b}=\frac{282}{u^{2}}$$

$$u\neq 0\text{ and }g=\frac{282}{283}$$