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Find the coordinates of the vertex of the graph of the following equation: 𝑦=(𝑥−3)(𝑥−7)y=(x−3)(x−7)

Question

Find the coordinates of the vertex of the graph of the following equation:

y = (x - 3)(x - 7)

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Solution

1. Break Down the Problem

To find the vertex of the quadratic equation given in factored form y=(x3)(x7) y = (x - 3)(x - 7) , we need to first identify the roots and then find the x-coordinate of the vertex.

2. Relevant Concepts

For a quadratic equation in factored form y=a(xr1)(xr2) y = a(x - r_1)(x - r_2) , the x-coordinate of the vertex can be calculated using the formula: xvertex=r1+r22 x_{vertex} = \frac{r_1 + r_2}{2} where r1 r_1 and r2 r_2 are the roots of the equation.

3. Analysis and Detail

  1. Identify the roots from the equation:

    • From y=(x3)(x7) y = (x - 3)(x - 7) , the roots are r1=3 r_1 = 3 and r2=7 r_2 = 7 .
  2. Calculate the x-coordinate of the vertex: xvertex=3+72=102=5 x_{vertex} = \frac{3 + 7}{2} = \frac{10}{2} = 5

  3. To find the y-coordinate of the vertex, substitute xvertex=5 x_{vertex} = 5 back into the equation: y=(53)(57)=(2)(2)=4 y = (5 - 3)(5 - 7) = (2)(-2) = -4

4. Verify and Summarize

We have calculated the x-coordinate of the vertex to be 5 5 and the y-coordinate to be 4 -4 . Therefore, the vertex of the graph is located at the point (5,4) (5, -4) .

Final Answer

The coordinates of the vertex are (5,4) (5, -4) .

This problem has been solved

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