mopsy510
I need help with my algebra homework! It has to do with "Completing a Square." Please help!
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NotTim
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what exactly is the qun
mopsy510
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3x^2-15x=0
blahblah_who_cares
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use perfect squares.
mopsy510
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Idk how kinda
blahblah_who_cares
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oh wait. nvm. this is a bad example for perfect squares. use the quadratic formula
mopsy510
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Whats the quadratic formula?
mopsy510
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What?
AravindG
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A quadratic equation is of the form
\[ax^2+bx+c=0\]
By method of completing the square , we write this as
\[a(x-h)^2+constant\]
blahblah_who_cares
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do not complete the square on this problem. the b is not divisible by 2.
mopsy510
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So if i dont complete the suare what do i do?
blahblah_who_cares
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the quadratic equation. which i have written.
blahblah_who_cares
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|dw:1359606249803:dw|
blahblah_who_cares
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that is the formula^^^
mopsy510
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So its |dw:1359606358086:dw|
mopsy510
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?
blahblah_who_cares
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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.
blahblah_who_cares
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|dw:1359606587124:dw|
mopsy510
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is that the answer?
blahblah_who_cares
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nope. u have to simplify. u should come out with 2 answers for x.
mopsy510
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Ok
mopsy510
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Why is it over 2?
blahblah_who_cares
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oh whoops. my bad. it should be over 6
mopsy510
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Why is it over 6 then?
blahblah_who_cares
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because ur a is 3. for the standard equation it is ax^2+bx+c
mopsy510
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Ohh so you have to multiply it by 2?
mopsy510
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ohh
mopsy510
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Can you help me with 16y^2+25=25
blahblah_who_cares
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are u sure u arent saying 16y^2+25y=25?
mopsy510
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Nope its just 25
blahblah_who_cares
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well that makes it simple. what do you think u have to do?
mopsy510
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I think i have to subtract 25 from each side so it becomes 16y^2=0
blahblah_who_cares
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and what is the only possible answer for y?
mopsy510
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16y^2
mopsy510
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?
blahblah_who_cares
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no. there is only 1 possible answer in the world for the term y. So what do you think y equals.
mopsy510
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196
blahblah_who_cares
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so what u are telling me is that 16*196^2=0?
mopsy510
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Ohh nvm. Is it 0?
mopsy510
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Isn't it suppose to have 2 answers?
blahblah_who_cares
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for this equation no. for the previous one yes.
mopsy510
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Ok. How would i complete the square for the equation y^2-3y?
blahblah_who_cares
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u would not want to complete the square for it unless u have to. do u have to?
mopsy510
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Yup
mopsy510
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It just says "complete the square"
mopsy510
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It doesn't say solve but the next equations say to solve
blahblah_who_cares
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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
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Ok thanks