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Let f(x)=x^2-23. Write the correct response.

a. For what values of x is f (x)=13?

b. Using an opposite, explain why f is an even function

c. Name the vertex of the parabola defined by function f

d. Determine the domain and range of function f

Roxettna Feb 20, 2019

#1**+1 **

a 13 = x^2-23

36 = x^2

x = +6 and -6

b "Even Function. A function with a graph that is symmetric with respect to the y-axis. A function is even if and only if f(–x) = f(x)"

Let's try 6 and -6 (which we already found both equate to 13....so it is even)

c -b/2a is the x value of the vertex point 0/-2 = 0

to find y sub x=0 into the equation = -23 Vertex = (0,-23)

d Domain is all x (-inf , + inf)

range is all y >= -23 [-23, +inf)

ElectricPavlov Feb 20, 2019