Mathematics
16 Online
OpenStudy (anonymous):
HELP PLEASE!!!!!!!!!!!! Solve the following quadratic equation by factoring:
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OpenStudy (anonymous):
\[x ^{2}-10x-24=0\]
OpenStudy (aravindg):
try to find two numbers whose sum is -10 and product is 24
OpenStudy (aravindg):
@nburgher
OpenStudy (anonymous):
2*-12
OpenStudy (anonymous):
@AravindG
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OpenStudy (aravindg):
so we can write the given equation as
(x+2)(x-12)=0
OpenStudy (aravindg):
and hence factorised :)
OpenStudy (anonymous):
yes x=2 or x=-12
but when put into a graphing calculator it does not make a parobola graph
OpenStudy (anonymous):
when doing quadratic equations does it always have to be a parobola graph @AravindG
OpenStudy (aravindg):
it will !!
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OpenStudy (aravindg):
yes a quadratic will always be a prabola
OpenStudy (anonymous):
it does not I checked it on a graphing calculator
OpenStudy (anonymous):
it makes a straight line
OpenStudy (aravindg):
try like this
\[(x+2) \times (x-12)=0\]
OpenStudy (aravindg):
try that
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OpenStudy (aravindg):
multiplication should be there
OpenStudy (anonymous):
it is still a straight line and it shows the x-intercept as -2
OpenStudy (anonymous):
@AravindG
OpenStudy (anonymous):
(-2,0)
OpenStudy (anonymous):
never mind I had to zoom out on the calculator
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OpenStudy (anonymous):
thank you for your help. I gave you a medal
OpenStudy (aravindg):
yw :)