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I need help with my algebra homework! It has to do with "Completing a Square." Please help!

Algebra
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what exactly is the qun
3x^2-15x=0
use perfect squares.

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Other answers:

Idk how kinda
oh wait. nvm. this is a bad example for perfect squares. use the quadratic formula
Whats the quadratic formula?
What?
A quadratic equation is of the form \[ax^2+bx+c=0\] By method of completing the square , we write this as \[a(x-h)^2+constant\]
do not complete the square on this problem. the b is not divisible by 2.
So if i dont complete the suare what do i do?
the quadratic equation. which i have written.
|dw:1359606249803:dw|
that is the formula^^^
So its |dw:1359606358086:dw|
?
no. because u do not have a c then last part of the term in the square root should be o. it should just be rad 15^2.
|dw:1359606587124:dw|
is that the answer?
nope. u have to simplify. u should come out with 2 answers for x.
Ok
Why is it over 2?
oh whoops. my bad. it should be over 6
Why is it over 6 then?
because ur a is 3. for the standard equation it is ax^2+bx+c
Ohh so you have to multiply it by 2?
yah
ohh
Can you help me with 16y^2+25=25
are u sure u arent saying 16y^2+25y=25?
Nope its just 25
well that makes it simple. what do you think u have to do?
I think i have to subtract 25 from each side so it becomes 16y^2=0
indeed
and what is the only possible answer for y?
16y^2
?
no. there is only 1 possible answer in the world for the term y. So what do you think y equals.
196
so what u are telling me is that 16*196^2=0?
Ohh nvm. Is it 0?
indeed.
Isn't it suppose to have 2 answers?
for this equation no. for the previous one yes.
Ok. How would i complete the square for the equation y^2-3y?
u would not want to complete the square for it unless u have to. do u have to?
Yup
It just says "complete the square"
It doesn't say solve but the next equations say to solve
ok here is the way u would do it. u would first make the equation equal to zero. Then u get half of b and square it. and the square to both sides. in this case it would be 1.5^2. then you would get (x+1.5)^2=1.5^2. Square root. x+1.5=1.5 Something like that. my math may be wrong because im starting to feel not that great. Hope that helped.
Ok thanks

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