## mathtard 4 years ago Find the x and y intercepts f(x) = -x^2+4x+45

1. Rita1975

X intercept means plug in f(x) = 0 and solve for x Y intercept means plug in x =0 and find f(x)

2. LagrangeSon678

|dw:1314673518595:dw|

3. satellite73

y intercept is the constant in this case it is (0,45)

4. mathtard

ok, so how do i get the x intercept?

5. LagrangeSon678

i just got them for you

6. LagrangeSon678

did you look at the drawing

7. LagrangeSon678

|dw:1314673935920:dw|

8. mathtard

so 0,45 isn't correct?

9. LagrangeSon678

that is the y intecept

10. LagrangeSon678

the i wrote (9,0) and (-5,0) are the x intercpets

11. mathtard

ok I guess Im just confused now.

12. LagrangeSon678

thats cause you need to study more

13. mathtard

I guess I do, but you are here to help people who don't get it as easily as you do right?

14. LagrangeSon678

yeah i am

15. LagrangeSon678

here man, check this out: To find the x intercepts, set y to be 0 and factor the polynomial like i did above, then set each term to zero and solve for x. To find the y intercept, set x to be zero and evaluate