X-Intercepts In Vertex Form
To find the X-intercept of the graph you would need need to set y=0 so you can isolate to find the value(s) of x. X can have more than one value because when you isolate the x you have to square one of the values. When you square a number the answer you get can be a positive or negative number of the root. For example if you square root 64 the answer is 8 or -8.
Here is an example of me solving a x-intercept question in vertex form:
Find the x-intercepts of y= 3(x-4)^2-15.
y=o to isolate for x
0=3(x-4)^2-15
15=3(x-4)^2
5=(x-4)^2
+ and - 2.23 =x-4
2.23+4=x and -2.23+4=x
6.23 and 1.77 the two x intercepts.
Here is an example of me solving a x-intercept question in vertex form:
Find the x-intercepts of y= 3(x-4)^2-15.
y=o to isolate for x
0=3(x-4)^2-15
15=3(x-4)^2
5=(x-4)^2
+ and - 2.23 =x-4
2.23+4=x and -2.23+4=x
6.23 and 1.77 the two x intercepts.