Ask your own question, for FREE!
Mathematics 7 Online
OpenStudy (hugsnotughs):

Did I do these correctly?

OpenStudy (hugsnotughs):

http://prntscr.com/55rhdy

OpenStudy (hugsnotughs):

http://prntscr.com/55rhq8

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

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.

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

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?

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.

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!