What is the axis of symmetry of the graph of y=7(x+1)(x−3)?

Rylan Duncan

Rylan Duncan

Answered

2022-01-23

What is the axis of symmetry of the graph of y=7(x+1)(x3)?

Answer & Explanation

Appohhl

Appohhl

Expert

2022-01-24Added 11 answers

Step 1
Given: y=7(x+1)(x3)
Note that this is a parabola in standard position (vertical axis of symmetry).
The axis of symmetry passes through the vertex.
One method of determining the vertex is by noting that the derivative of the function is equal to zero at the vertex
y=7(x+1)(x3)
=7x214x21
dydx=14x14
If dydx=0
x=1
We could now calculate the value of y at the vertex, but we don't really need it since we are looking for the vertical line passing through x=1
The axis of symmetry is
x=1
An other way:
In a parabola of this kind you can also find the midpoint between the two points where the curve crosses the x-axis
As you will see y=0x=1 or x=+3
x=1 is halfway.
Same answer, less work, but this method is not always usable.

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