Question

8 + 7y - y^2
answer: -(y+1)(y-8)
how do you get the negative sign?

Answer 1

In the original equation, they probably factored out a negative one before doing anything else, just to make the 7 positive.

Answer 2

Is this correct?
= -(y^2 + 7y + 8)
= y^2 - 7y - 8
= y^2 + y - 8y - 8
= (y^2 + y) - (8y - 8)

Answer 3

= y(y) - 8(y)
=(y + 1)(y-8)

Answer 4

I just dont know how they got the negative sign before the brackets....

Answer 5

If you factor out a -, the 8 changes to -8

Answer 6

?

Answer 7

-8 times -1= 8
in your first one, its a +8, right? when you take out the -1, it turns into -8

Answer 8

So that's how the negative sign was there....?

Answer 9

You distribute

Answer 10

e.g: