Question

What are the solutions of x(x - 2) = 5?

Answer 1

distribute out to find x^2 - 2x - 5 = 0, solve

Answer 2

use the quadratic formula

Answer 3

I forget formula

Answer 4

just used quadratic formula to solve for x: a=1 b=-2 and c=-5

Answer 5

yes what is the quadrati formula

Answer 6

please tell me

Answer 7

Difficult to type: http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

Answer 8

where a, b, and c come from the quadratic expression you have (ax^2 + bx + c = 0)

Answer 9

ok I saw it now thanks

Answer 10

\[x=\frac{-b\pm\sqrt{b^2 -4ac}}{2a}\]

Type x=\frac{-b\pm\sqrt{b^2 -4ac}}{2a} in equation editor

Answer 11

ok I got it

Answer 12

so what is the result?

Answer 13

my result is not right

Answer 14

-1 plus or minus sqrt 6

Thought you would have worked out yourself by now...

Answer 15

-2 plus minus sqrt(4 +20)/2

Answer 16

x= 2+ squared 4- 4.5/2

Answer 17

but b= minus2

Answer 18

u need to be more careful with your signs

b =-2 and it's 4*-5

Answer 19

their answer is 1 - sqrt(6) and 1 + sqrt(6)

Answer 20

why sqrt(6)?

Answer 21

sqrt(24) = sqrt(4)sqrt(6) and the sqrt(4) = 2 cancels with the 2 on the bottom.

Answer 22

x(x-2)=5
x^2-2x=5
x^2-2x+1=5+1
(x-1)^2+6
x-1= plus or minus sqrt{6}
x=1 plus or minus sqrt{6}
x=1+sqrt{6} or x=1-sqrt{6}

Answer 23

oh I see thank you

Answer 24

oops that one line should read (x-1)^2=6
not (x-1)^2+6 lol

Answer 25

yes