Find the x-intercepts of the function.
f(x)=x^1/2+1x^1/4-90

Question

Find the x-intercepts of the function.
f(x)=x^1/2+1x^1/4-90

anonymous · Answer

r u there?

anonymous · Answer

set f(x) to zero then solve

anonymous · Answer

yeah

anonymous · Answer

proceed... how do you do that?

anonymous · Answer

you will need to factor to solve

anonymous · Answer

keep going...

anonymous · Answer

oh wait fraction exponents my bad

anonymous · Answer

lol

anonymous · Answer

dooh... i thought i was talking to the asker....

anonymous · Answer

lol

anonymous · Answer

we can do the same as if we were solving a quadratic..

anonymous · Answer

i don't understand what to do

anonymous · Answer

if we let u=x^1/4.  so now your equation is in quadratic form:
u^2 + u - 90 = 0

anonymous · Answer

the first thing is x^(1/2) tho ?

anonymous · Answer

can you solve that equation i just wrote?

anonymous · Answer

oh wait lol wow sorry

anonymous · Answer

(1/4)*2 haha =)

anonymous · Answer

or you can just solve 0 = x^{1/2}+x

anonymous · Answer

i don't understand how to solve that.

anonymous · Answer

first of all what is the equation?

anonymous · Answer

this equation?:  u^2 + u - 90 = 0
factor...

anonymous · Answer

no i'm wondering if this equation is $$x^{1/2}$$ or if its a fraction or something lol

anonymous · Answer

i dont know, i really dont know any of this.  i have a list of answers that i can choose from that i can list

anonymous · Answer

dpanic basically gave you the answer all you have to do is remember FOIL.

anonymous · Answer

whats is foil?

anonymous · Answer

okay Ill give an example if you had x^2 + 2x +1 you could also write that as (x+1)(x+1) you just have to follow this same process but for your equation or if that doesn't work use quadratic formula

anonymous · Answer

so x^2 = (x+1) (x+1)?

anonymous · Answer

no expand what you see and brackets and you will see it does not equal x^2

anonymous · Answer

do you know how to expand what you have in brackets?

anonymous · Answer

no

anonymous · Answer

x^1/2+1x^1/4-90 = 0
Let X = x^1/4,  
==> X^2 + X - 90 = 0

Do you understand up to this point?

anonymous · Answer

Chlorophyll she/he needs to learn factoring in general just ordinary factoring dpanic already got him/her to that point btw

anonymous · Answer

i dont really understand what u did

anonymous · Answer

@pleasecrystal that's the whole point why you're on OS website!
Take a close look and learn how to solve, will you :)