Finding spring constant

Question

I have to rearrange the equation:

$$T=2\pi \sqrt{\frac{m}{k}}$$

To find the spring constant $k$.

The answer I got is $\frac{T^2 - m}{ 4\pi^2}.$

Is this correct ?

Answer 1

$$T=2\pi \sqrt{\frac{m}{k}}$$ $$\frac{T^2}{4\pi^2}=\frac{m}{k}$$

$$\frac{k}{m}=\frac{4\pi^2}{T^2}$$

Are you able to solve for $k$?