Explanation:
the picture asks for similar things as your text but got other numbers.
let's do both.
first the picture :
find g(0) and one value of x for which g(x) = 0.
g(0) means that x = 0.
so, we find x = 0 on the x-axis (it is where the y-axis intersects) and then go straight up or down until we meet or intersect the function curve.
in our case we go up and intersect the curve at y = 2.
and that is the result.
y = g(x), it is a named variable for the function result, nothing else.
so,
y = g(0) = 2
to find a value of x for which g(x) = 0 means we go along the x-axis (these are all the points for which y = 0) until the x-axis intersects with the curve.
and that is here at x = -1.
now for your text :
we repeat the same principles.
but now, we need to use imaginary lines that go parallel to the x- and y-axis.
your text now calls the function h(x), but since I have no other information, I assume it is the same line function in the picture.
for which value of x is h(x) = -4 ?
remember, y is just the variable that stands for the function result.
so, we are asking for
y = h(x) = -4
imagine a horizontal line through y = -4.
where does it intercept the line h(x) ?
at that point we go straight up or down (in our case up) to the x-axis and read the x-value there : -3
so,
y = h(-3) = -4
to find h(1) we find x = 1 on the x-axis, and from there we go straight up or down (in our case up) parallel to the y-axis until we intersect the function curve.
from there we go straight left out right (in our case left) to the y-axis and read the y-value there : 4
so,
y = h(1) = 4