Algebra
10 Online
OpenStudy (anonymous):
Let f(x) = 2x2 - 2x + 7 and g(x) = x2 + 9x - 6. Find f(x) - g(x).
a. x2 - 11x + 13
b. x2 - 11x + 1
c. x2 + 7x + 1
d. x2 + 7x + 13
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OpenStudy (jlg030597):
obviously
2x2-2x+7-x2+9x-6
OpenStudy (jlg030597):
thats wheres you start
OpenStudy (jlg030597):
or is that - an = sign
OpenStudy (anonymous):
no
OpenStudy (jlg030597):
ok so that equation is correct then
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
why is the x in front of the 2? Usually you put the number in front of the variable
OpenStudy (jlg030597):
so now simplify it and thats confusing
OpenStudy (jlg030597):
yah ^^^^^^^^^^
OpenStudy (anonymous):
and when you mean 2x2 do you mean 2x^2 (2x to the second power)
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OpenStudy (anonymous):
thats why im confused
OpenStudy (anonymous):
yes
OpenStudy (jlg030597):
Its A or B i think
OpenStudy (jlg030597):
is that 2 * 2
OpenStudy (anonymous):
i was thinking a
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OpenStudy (anonymous):
you should right 2x^2 not 2x2, you'll confuse people, and it will your answer might end up wrong
OpenStudy (anonymous):
i forgot to
OpenStudy (jlg030597):
ok so thatd be 4x
OpenStudy (jlg030597):
Your guess is right
OpenStudy (anonymous):
btw the answer is A
because when you're subtracting a negative, it turns into a positive, so you add
for example: 2-(-4) = 2+4+6
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OpenStudy (anonymous):
ok
OpenStudy (jlg030597):
2x2-2x+7-x2+9x-6
4x-2x+7-x2+9x-6
2x+7-x2+9x-6
7-x2+11x-6
-x2+11x+13
or else
x2-11x+13 A.
OpenStudy (jlg030597):
now i feel dumb for answering after you already did
OpenStudy (anonymous):
|dw:1396647435745:dw|
OpenStudy (anonymous):
oops -11x, not 7x my bad
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OpenStudy (jlg030597):
your fine