If the Ellipse $x^{2}+9 y^{2}-4 x-72 y+139=0$ Is Written in Standard Form

Short Answer

If the ellipse $x^{2}+9 y^{2}-4 x-72 y+139=0$ is written in standard form $\frac{(x-h)^{2}}{a^{2}}+\frac{(y-k)^{2}}{b^{2}}=1$ , then h=-----------,k=----------,a=-----------,and b=---------.