X AND Y INT AND VERTEX FORM

To find an x intercept you plug in

• zero for y

• zero for x

• one for y

• one for x

To find a y intercept you plug in

• zero for y

• zero for x

• one for y

• one for x

after you plug in zero for y when finding x-intercepts then you first try to...

• simplify

• factor

• ignore the constant

If you're trying to find x-intercepts and you can't factor then you...

• simplify

• plug in zero for x

• use the quadratic formula

 $x=\frac{-b\pm\sqrt{b^2-4\left(?\right)c}}{2\left(?\right)}$  
What goes in for both of the (?) in the quadratic formula

(a)  

 $x=\frac{-\left(?\right)\pm\sqrt{\left(?\right)^2-4ac}}{2a}$  
What goes in for both of the (?) in the quadratic formula

(a)  

Find the y intercept of:

 $y=3x^2+2x\ -10$  

• 3

• 2

• -10

Check the transformations that have occurred:

 $y=\frac{1}{8}\left(x-5\right)^2+2$  

• horizontal stretch

• vertical stretch
  

• right 5

• left 5

• up 2

Check the transformations that have occurred:

 $y=-\frac{15}{2}\left(x+1\right)^2$  

• horizontal stretch

• vertical stretch
  

• right 1

• left 1

• flipped

Check the transformations that have occurred:

 $y=-x^2+5$  

• down 5

• vertical stretch
  

• right 5

• up 5

• flipped