Mathematics
13 Online
OpenStudy (anonymous):
factor completely:
see below:
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OpenStudy (anonymous):
\[x ^{2}+2x-24\]
OpenStudy (anonymous):
find two numbers that add to positive 2 and multiply to negative 24
OpenStudy (anonymous):
nothing is coming to me
OpenStudy (anonymous):
bruh just think about it
OpenStudy (anonymous):
24 1
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OpenStudy (anonymous):
24+1 is 25 and 24-1 is 23
OpenStudy (anonymous):
-12 2
OpenStudy (anonymous):
no thats not it either
OpenStudy (anonymous):
here il tell u what i do
OpenStudy (anonymous):
i just grab a calculator and type 24/ whatever
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OpenStudy (anonymous):
24 divided by 1
24 divided by 2
24 divided by 3?????
OpenStudy (anonymous):
and i try values till i get two numbers that have a difference of 2
OpenStudy (anonymous):
and guess what 24/4=6
OpenStudy (anonymous):
!!
OpenStudy (anonymous):
6??
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OpenStudy (anonymous):
6-4=2
OpenStudy (anonymous):
good!
OpenStudy (anonymous):
unbelieveable. I would of never got that. thank you
OpenStudy (anonymous):
it works now u just put it in the parentheses with x
OpenStudy (anonymous):
make sure that the negative goes with the 4
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OpenStudy (anonymous):
(x+6)(x-4)???
OpenStudy (anonymous):
ok got it. larger number goes with the first sign?
OpenStudy (anonymous):
not always u gotta test it and make sure
OpenStudy (anonymous):
oh ok. got it
OpenStudy (anonymous):
if the number u want has to be positive then the smaller number gets the minus
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OpenStudy (anonymous):
lets work on another one
OpenStudy (anonymous):
Ya you should do some of these to practice cuz i used to suck at them and now its like automatic
OpenStudy (anonymous):
\[x ^{2}-9x+18\]
OpenStudy (anonymous):
3 and 6?
OpenStudy (anonymous):
yep just find the right signs
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OpenStudy (anonymous):
(x-6)(x-3)?
OpenStudy (anonymous):
perfect mang
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
\[x ^{2}-4x+7\]
OpenStudy (anonymous):
r u making these up or getting them from a book?
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OpenStudy (anonymous):
not looking like its factorable
OpenStudy (anonymous):
from a book
OpenStudy (anonymous):
nothing goes in to 7 that equals 4 so the answer would be not factorable correct?
OpenStudy (anonymous):
yep thats right