Consider the given equation,
[tex]\begin{gathered} \frac{x^2}{49}+\frac{y^2}{7}=1 \\ \frac{x^2}{(7)^2}+\frac{y^2}{(\sqrt{7})^2}=1 \end{gathered}[/tex]
This is a standard equation of a horizontal ellipse, whose semi-major axisis given as,
[tex]a=7[/tex]
So the length of major axis will be,
[tex]2a=2(7)=14[/tex]
Thus, the length of major axis of the given equation is 14 units.
