Mathematics
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OpenStudy (andriod09):
Quadratic Equation question
How do i get from:
\[x=-11\pm \frac{121-60}{ 6 }\]
to the next part?
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OpenStudy (andriod09):
@jwheele1
OpenStudy (jwheele1):
ok
OpenStudy (anonymous):
im working on those problems too im not that good but i would simplify 121-6/ then.. which is?
OpenStudy (jwheele1):
well first of all.....write out two different equations to eliminate that +-
OpenStudy (andriod09):
@cos00155079 you doing the Life of Fred series?
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OpenStudy (andriod09):
you don't have to do that @jwheele1
OpenStudy (jwheele1):
i know you dont have to but its easier...its cool we wont do that then
OpenStudy (anonymous):
the what? nooo...
OpenStudy (jwheele1):
121 - 60 = ?
OpenStudy (andriod09):
61
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OpenStudy (andriod09):
10
OpenStudy (andriod09):
\[1\]
\[-21\]
OpenStudy (anonymous):
why 60/6 if it was a 61?
OpenStudy (andriod09):
ik
OpenStudy (jwheele1):
alright lets see now...
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OpenStudy (andriod09):
the equation is:
\[x=-11\pm \frac{ \sqrt{121-60} }{ 6 } \]
OpenStudy (jwheele1):
oh lawd....lol
OpenStudy (jwheele1):
sq rt of 121 = 11
OpenStudy (jwheele1):
whats with teh line over the 0?
OpenStudy (andriod09):
its just how it is. not my doing.
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OpenStudy (jwheele1):
well...it means that its a repeating number but its usually only after a decimal point...weird.
OpenStudy (jwheele1):
I have no idea what to do with the 60 and the line over it.
OpenStudy (andriod09):
the original equation is:
\[3x^{2}+11x+5=0\]
OpenStudy (jwheele1):
any specific way she is wanting you to go about that?
OpenStudy (andriod09):
its a messup about square roots.
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OpenStudy (jwheele1):
or can we solve for x any old way?
OpenStudy (andriod09):
yea, using \[ax^{2}+bx+c=0\] and the
\[x=-b\pm\frac{ \sqrt{b^{2}-4ac} }{ 2a }\]
OpenStudy (jwheele1):
the QuAdRaTiC ForMulA.....lol
OpenStudy (jwheele1):
ok so
3x^2 + 11x +5 = 0
ax^2 + bx +c
OpenStudy (jwheele1):
a = 3
b = 11
c = 5
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OpenStudy (jwheele1):
\[-11\pm \frac{ \sqrt{11^{2}-4(3*5c)} }{ 2(3) }\]
OpenStudy (jwheele1):
does that look right?
OpenStudy (jwheele1):
ignore the c next to the 5, lol
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