Posted by **Cindy** on Tuesday, September 28, 2010 at 11:21pm.

if f(x)= (x-4)(x=3) determine the x intercept of the funtion if

y= -2f(x)...

i just don't know if the -2 affects the answer because that only affects the y co ordinates. in the book it says 4,-3 but i don't know why.

if this is true if the they were asking me to find the y interpct of the function what do i do. THANKS!!!!

- grade 11 math -
**Reiny**, Wednesday, September 29, 2010 at 12:22am
You have a typo, but looking at their answers of 4, and -3 , I know it must have been

f(x) = (x-4)(x+3)

so we want

y = -2(x-4)(x+3)

for the x-intercepts, y = 0

then

-2(x-4)(x+3) = 0

x-4 =0 or x+3 = 0

x = 4 or x = -3 , as stated.

for y-intercept let x = 0, real easy ....

y = 2(0-4)(0+3) = -24

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