mopsy510
  • mopsy510
I need help with my algebra homework! It has to do with "Completing a Square." Please help!
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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NotTim
  • NotTim
what exactly is the qun
mopsy510
  • mopsy510
3x^2-15x=0
anonymous
  • anonymous
use perfect squares.

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

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