Question

Help with geometry problem please

Answer 1

9x=(x-2)*(x+4)

Answer 2

first you have to use distributive property

Answer 3

so i get 9x=x^2 +4x-2x-8

Answer 4

and then 9x=x^2 +2-8 and thats where im stuck

Answer 5

you have to make the equation equal zero on the other side now

Answer 6

so you would do 9x-what you got when you distributed

Answer 7

so 0=x^2 -7x-8?

Answer 8

almost change the sign remember that there will be an imaginary negative

Answer 9

therefore −x2+7x+8=0

Answer 10

−x^2+7x+8=0

Answer 11

so far so good?

Answer 12

yeah

Answer 13

alright now you would factor it

Answer 14

?

Answer 15

are you familiar with factoring?

Answer 16

yes it just idk what to factor

Answer 17

−x^2+7x+8=0

Answer 18

is a quadratic equation so it can be factored

Answer 19

http://www.purplemath.com/modules/factquad.htm

Answer 20

so is it (8-x)(1+x)

Answer 21

almost remember the negative sign

Answer 22

you did a good job but remember that the x has to be in front or else your numbers will be different/confusing
Therefore (−x−1)(x−8)=0

Answer 23

and your two responses would be.......

Answer 24

two responses?

Answer 25

yes quadratic always have two answers :)

Answer 26

got it?

Answer 27

yeah thanks

Answer 28

no problem :)
and just in case
x=−1 or x=8