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

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- mopsy510

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

- chestercat

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- NotTim

what exactly is the qun

- mopsy510

3x^2-15x=0

- anonymous

use perfect squares.

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- mopsy510

Idk how kinda

- anonymous

oh wait. nvm. this is a bad example for perfect squares. use the quadratic formula

- mopsy510

Whats the quadratic formula?

- mopsy510

What?

- AravindG

A quadratic equation is of the form
\[ax^2+bx+c=0\]
By method of completing the square , we write this as
\[a(x-h)^2+constant\]

- anonymous

do not complete the square on this problem. the b is not divisible by 2.

- mopsy510

So if i dont complete the suare what do i do?

- anonymous

the quadratic equation. which i have written.

- anonymous

|dw:1359606249803:dw|

- anonymous

that is the formula^^^

- mopsy510

So its |dw:1359606358086:dw|

- mopsy510

?

- anonymous

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.

- anonymous

|dw:1359606587124:dw|

- mopsy510

is that the answer?

- anonymous

nope. u have to simplify. u should come out with 2 answers for x.

- mopsy510

Ok

- mopsy510

Why is it over 2?

- anonymous

oh whoops. my bad. it should be over 6

- mopsy510

Why is it over 6 then?

- anonymous

because ur a is 3. for the standard equation it is ax^2+bx+c

- mopsy510

Ohh so you have to multiply it by 2?

- anonymous

yah

- mopsy510

ohh

- mopsy510

Can you help me with 16y^2+25=25

- anonymous

are u sure u arent saying 16y^2+25y=25?

- mopsy510

Nope its just 25

- anonymous

well that makes it simple. what do you think u have to do?

- mopsy510

I think i have to subtract 25 from each side so it becomes 16y^2=0

- anonymous

indeed

- anonymous

and what is the only possible answer for y?

- mopsy510

16y^2

- mopsy510

?

- anonymous

no. there is only 1 possible answer in the world for the term y. So what do you think y equals.

- mopsy510

196

- anonymous

so what u are telling me is that 16*196^2=0?

- mopsy510

Ohh nvm. Is it 0?

- anonymous

indeed.

- mopsy510

Isn't it suppose to have 2 answers?

- anonymous

for this equation no. for the previous one yes.

- mopsy510

Ok. How would i complete the square for the equation y^2-3y?

- anonymous

u would not want to complete the square for it unless u have to. do u have to?

- mopsy510

Yup

- mopsy510

It just says "complete the square"

- mopsy510

It doesn't say solve but the next equations say to solve

- anonymous

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.

- mopsy510

Ok thanks

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