Mathematics
7 Online
OpenStudy (hugsnotughs):
Did I do these correctly?
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OpenStudy (anonymous):
First one is correct but second is not
OpenStudy (hugsnotughs):
WHere did I go wrong?
OpenStudy (anonymous):
x^2 +(sum)x + product = 0
your sum isnt correct. because 8*-2 = -16 not 1
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OpenStudy (hugsnotughs):
So...I'm trying to see how to do this again...
OpenStudy (wmj259):
For your first one you should have (x+8).
OpenStudy (hugsnotughs):
Oh! When I split the middle term. I need to find two factors that equal 1...
OpenStudy (hugsnotughs):
Instead of x - 8 @wmj259 ?
OpenStudy (wmj259):
Yes.
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OpenStudy (anonymous):
x+y = 6
xy= 1
OpenStudy (hugsnotughs):
Okay, I'm confused. So I have to find two factors that add up to 6 and when multiplied, equal 1? That's impossible...
OpenStudy (wmj259):
The otherway. Product equals 6 and adds together to get 1.
OpenStudy (wmj259):
Lets go small first.
What 2 numbers multiplied together equals 6?
OpenStudy (hugsnotughs):
1, 6
2, 3
6, 1
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OpenStudy (wmj259):
Well,,, actually...
OpenStudy (wmj259):
Are you supposed to use solve by completing the square?
OpenStudy (wmj259):
For your first question, you are correct up to the second line.
OpenStudy (wmj259):
x^2+6-16
x^2+8x-2x-16
x(x+8)-2(x+8)
OpenStudy (wmj259):
Correct?
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OpenStudy (hugsnotughs):
Okay.
OpenStudy (hugsnotughs):
Yes, I am supposed to solve by completing the square.
OpenStudy (wmj259):
Notice what I did and what you did.