What is the axis of symmetry and the x and y intercept of f(x)=x^2-4x

Question

amistre64 · Answer

y int = 0   becasue there is no constant on the end of your equation

amistre64 · Answer

x(x-4) = = gets your x ints

x = 0  and x = 4

amistre64 · Answer

the axis of symmetry is where your vertex is; at -b/2a

4/2(1) = 2   x = 2 is your axis of symmetry

anonymous · Answer

ok, so whenever there is no constant the y intercept is always 0

amistre64 · Answer

you could have also just wnet half way between the xints :)

amistre64 · Answer

that last number tells you where it crosses the y axis; if there is no number that just means that it is actually a +0 that they decide not to write...

x^2 -4x  =  x^2 -4x +0  right?

anonymous · Answer

right!  I have the vertex as 2,-4 is that correct?

amistre64 · Answer

when you plug in the x=2, you get the answer for the "y" part, so yes :)

anonymous · Answer

Ugh!! Thanks! I am going crazy here with this math class!!

amistre64 · Answer

i was bored to tears in college algebra..... and in trig..... and probably will be this summer in stats and calculus1

anonymous · Answer

I usually do well in math but I am taking on line classes so not having the teacher there to explain things is what is making it difficult!

amistre64 · Answer

stats should be ok....i aint to brushed up on it :)

anonymous · Answer

I got a D in statistics!

amistre64 · Answer

..... well...... if you did your best, then that is a mighty fine D :)

anonymous · Answer

I think it was the teacher, he was all over the place!  I am a nurse and always was very good in math.

amistre64 · Answer

rn  lpn..??  my mother was a lpn and she loved it, grandma and aunt and family are nurses

anonymous · Answer

I have been an LPN for 12 years and i love it but i am going back to school to be a teacher

amistre64 · Answer

after 20 years of the workplace, I decided to go back to school as well; getting me a bachelors in business and a masters in math....end goal is to be a college math teacher...

anonymous · Answer

oh wow, good for you!  I am leaving nursing for my kids, I love being able to spend time with them, they are 6 and 11 and growing so fast!

amistre64 · Answer

yeah, mine are 13 and 15 now :)

anonymous · Answer

They grow up too fast!!

amistre64 · Answer

:)  and too loud  lol

anonymous · Answer

oh yeah!  My 11 yr old has quite the little attitude as well!