Question

Use the zeros and the labels point to write the quadratic function represented by the graph.

Answer 1

zeros: (-1,0) and (2,0)

Use the zeros to write the factors of the function as follow:

zeros: (b,0) and (c,0)

$y=a(x-b)(x-c)$$\begin{gathered} y=a(x-(-1))(x-2) \\ y=a(x+1)(x-2) \end{gathered}$

Use the given oint (1,6) to find the value of a:

$\begin{gathered} 6=a(1+1)(1-2) \\ 6=a(2)(-1) \\ 6=-2a \\ \frac{6}{-2}=a \\ \\ a=-3 \end{gathered}$

The function is:

$y=-3(x+1)(x-2)$

Use FOIL method and distributive property to simplify:

$\begin{gathered} y=-3(x*x-2*x+1*x-2*1) \\ y=-3(x^2-2x+x-2) \\ y=-3(x^2-x-2) \\ \\ y=-3x^2+3x+6 \end{gathered}$

Then, the function in the graph is y=-3x^+63x+6

Answer: D.