The y-intercept of a graph is the point at which it crosses the y-axis. This point can be found by replacing the variable "x" by 0 in the expression of the function. This is done below:
[tex]\begin{gathered} f(0)=25\cdot0^2-49 \\ f(0)=-49 \end{gathered}[/tex]
The y-intercept of this function is the point (0, -49).
