Determine Point A on the Quadratic Function: f(x) = x² - 8x + 16

Question

The following function has been graphed below:

f(x)=x28x+16 f(x)=x^2-8x+16

Calculate point A.

AAACCC

Video Solution

Solution Steps

00:00 Find the coordinates of point A
00:03 Point A is the intersection point with the Y-axis of the function
00:08 At the intersection point with Y-axis, X = 0
00:12 Substitute X=0 in the function and solve to find Y value
00:27 This is the Y value at point C
00:35 And this is the solution to the problem

Step-by-Step Solution

Let's solve the problem by following the outlined analysis:

  • Step 1: Identify important points on the parabola.
  • Step 2: Calculate the y-intercept by evaluating f(0) f(0) .
  • Step 3: Confirm understanding of the vertex form and its characteristics.

Step 1: Identify the significant points on the function.
The function given is f(x)=x28x+16 f(x) = x^2 - 8x + 16 .

This function can be seen as
f(x)=(x4)2 f(x) = (x - 4)^2 .

This format not only indicates it is always non-negative but also reveals the vertex is located at x=4 x = 4 , importantly, with f(x)=0 f(x) = 0 .

Step 2: Calculate the y-intercept.
Evaluate the function at x=0 x = 0 :

f(0)=0280+16=16 f(0) = 0^2 - 8 \cdot 0 + 16 = 16 .
So, the y-intercept is (0,16) (0, 16) .

Thus, point A, which is often labeled at a crucial intercept, corresponds to the y-intercept of the function. The calculation confirms that point A is (0,16) (0, 16) .

Therefore, the solution to the problem is (0,16) (0,16) .

Answer

(0,16) (0,16)