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It is important to note that we do not need to graph the parabola to identify the desired information. Let's compare the general formula for the graphing form to our equation. General Formula:f(x)=& a(x- h)^2+k Equation:f(x)=& 1(x- 2)^2+9 We can see that a= 1, h= 2, and k=9. The vertex of a quadratic function written in graphing form is the point ( h,k). For this exercise, we have h= 2 and k=9. Therefore, the vertex of the given equation is ( 2,9).
Before we determine if the vertex is the maximum or minimum point recall that, if a>0, the parabola opens upwards. Conversely, if a<0, the parabola opens downwards.
In the given function, we have a= 1, which is greater than 0. Thus, the parabola opens upwards and we will have a minimum value. The vertex is always the lowest or the highest point on the graph. Therefore, in this case, the vertex represents the minimum value of the function.
f(x)= (x-2)^2_(square)+ 9 ← constant Notice that the constant is positive and regardless of what number we substitute for x, the square part will always be non-negative. Adding a positive constant to non-negative number will always give us a positive value of a function, so the graph of the given function will be above the x-axis. Let's look at the given equation. (x-2)^2+9=0 This is the equation for the x-intercepts of the given function. Since the graph is above the x-axis, there are no x-intercepts. Therefore, the equation has no real solutions.
sqrt(LHS)=sqrt(RHS)
Calculate root
LHS+2=RHS+2
Split into factors
sqrt(a* b)=sqrt(a)*sqrt(b)
Calculate root
sqrt(- 1)= i