smorze
24.09.2019 •
Mathematics
Graph f(x) = x2 + 2x - 3, label the function’s x-intercepts, y-intercept and vertex with their coordinates. also draw in and label the axis of symmetry
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Ответ:
The given function :
Using completing the squares, we have
[∵ ]
(1)
Comparing (1) to the standard vertex form , the vertex of function is at (h,k)=(-1,-4)
For x-intercept, put f(x)=0 in (1), we get
Square root on both sides, we get
∴ x intercepts : x= (-3,0) and (1,0)
For y-intercept put x=0 in (1), we get
∴ y intercept : (0,-3)
Axis of symmetry :
In , a=1 and b=2
Axis of symmetry=
Ответ:
A
Step-by-step explanation: