anonymous
  • anonymous
x=-b+/- multipled by the square root of b squared - 4 ac
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
yes?
myininaya
  • myininaya
\[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]
anonymous
  • anonymous
ok look my teacher gave us some equations and one of them are \[{x}^2+6x+9=0\] and the answeres are x=-3 so i dont get it

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More answers

anonymous
  • anonymous
yes, this is (x+3)^2 so x = -3
anonymous
  • anonymous
ok ;) so how do iget the answer for the first one
anonymous
  • anonymous
Take the coefficient of the terms: i.e. the function is in ax^2+bx+c=0 form and plug the values of a, b, and c into the formula myiniaya posted, that is one way.
anonymous
  • anonymous
which one is the first one?
anonymous
  • anonymous
the first one is \[x=-b \pm \sqrt{b ^{2}- 4ac} \div 2a\] ;D
myininaya
  • myininaya
what do you want to solve for?
anonymous
  • anonymous
what about it?
myininaya
  • myininaya
we can solve it for b, a, or c? its already solved for x
anonymous
  • anonymous
that is the quadratic formula to find roots.
anonymous
  • anonymous
well yeah the teacher wants us to find all thee a b and c but i dont reallly know how!
myininaya
  • myininaya
she wants you to solve the quadratic formula for a then b then c are you sure?
anonymous
  • anonymous
yes thats what she said :S
myininaya
  • myininaya
k let's see if we can do it let's try to solve for a first
anonymous
  • anonymous
ok ;D
anonymous
  • anonymous
it is impossible to solve this equation for a b and c
myininaya
  • myininaya
one sec
myininaya
  • myininaya
i think you can use the quadratic formula to solve for a lol
anonymous
  • anonymous
which is??
myininaya
  • myininaya
1 Attachment
anonymous
  • anonymous
yes, but it impossible to solve for all three values of a,b and c
myininaya
  • myininaya
lol. i honestly don't think this what your teacher wants
myininaya
  • myininaya
i can solve for b and c use the quad on b and c is easiest
anonymous
  • anonymous
no, you cannot. x can hold only two values. you need atleast 3 equations to solve for 3 unknown variables.
myininaya
  • myininaya
a doeesnt have to be both it can be one or the other just like x
anonymous
  • anonymous
you may be able to get a,b and c in terms of the other variables, but that doesn't get you any closer to solving for them.
myininaya
  • myininaya
right but it sounded like he wanted us to solve the quadratic formula for each lol
anonymous
  • anonymous
oh, that is just an exercise in stupidity.
anonymous
  • anonymous
there is no point of that. I don't think their teacher asked them to solve for a,b and c.
myininaya
  • myininaya
me neither

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