Without drawing, deduce the value of the [[$ y $]] coordinate at the point where the function graph intersects the [[$ y $]] axis?

a) [[$ f(x) = x^2 - 7 $]]

Answer: The function intersects the [[$ y $]] axis when [[$ y = $]] .

b) [[$ f(x) = x^2 + 4 $]]

Answer: The function intersects the [[$ y $]] axis when [[$ y = $]] .

c) [[$ f(x) = x^2 - \displaystyle\frac {1} {2} $]]

Answer: The function intersects the [[$ y $]] axis when [[$ y = $]] .

d) [[$ f(x) = 3x^2 + 6 $]]

Answer: The function intersects the [[$ y $]] axis when [[$ y = $]] .