Question

For problems 1 – 6, graph each function. Label the vertex and axis of symmetry.

1. y=x^2-2x-1

2. y-3=(x+2)^2

3. y=(x+3)(x-4)

4. y=2x^2-12x-19

5. y-9=-5(x-2)^2

6. y=-3x(x-2)

Answer 1

1. $y=x^{2} -2x-1$

a= 1 , b= -2 , c= -1

$\frac{-b}{2a}$$\frac{- (-2)}{2 times 1}$

x=1

now use the x value to find y

$y=1^{2} -2 times 1 - 1$

y = -2

vertex (1,-2)