Males Vs Females Game

[Night Owl]

60

The answer to annie's problem is 7

 

[Eduarda]

61

63



I know the feel too well.



Completely factor everything and then set each () = 0. [like x+1=0, x+2=0, etc. the 2 and 4 make x=0, I believe.]

This is of a parabolic function. So there must only be 2 answers. I did this so far:

2(x+1)(x+2)-4(x-1)^2=0
(2x+2)(x+2)-4(x^2-2x+1)=0
2x^2+4x+2x+4-4x^2+8x-1=0
-2x^2+14x+3=0

Then I have to find 2 numbers with the product of -6, and sum of 14

I think I've gotten something really wrong, and am too sleepy to see it. Meh. I'll just leave it. It's not a test actually. Just a quiz. So hopefully, other questions would be there. I understand all the other questions. Just not this one I'm probably just doing a really stupid mistake, and can't see it

You don't need to bother trying to correct me. I'm logging off now, and getting to bed.

So good night everyone ^^

Also, happy VE day

Edit: I think I found the mistake. It was in the 2nd line. (2x+2) isn't supposed to be bracketed. But then I got the solution as x=0 and x=-3. And the answer is x=0 and x=7. Meh. I'll look at it tomorrow in the morning.

 

[Night Owl]

60

How I solved it:
2(x+1)(x+2) -4(x-1)^2=0
2(x^2+3x+2) -4(x^2-2x+1)=0
2x^2+6x+4-4x^2+8x-4=0
-2x^2+14x=0
14x=2x^2
7x=x^2

x=7or0

 

[linkypete]

59

 

[Keyshe]

60

 

[Krazy4Krash]

59

 

[robow87]

58

 

[linkypete]

57

 

[robow87]

56

 

[Keyshe]

57

 

[Night Owl]

56

 

[Keyshe]

57

 

[Eduarda]

58

60

How I solved it:
2(x+1)(x+2) -4(x-1)^2=0
2(x^2+3x+2) -4(x^2-2x+1)=0
2x^2+6x+4-4x^2+8x-4=0
-2x^2+14x=0
14x=2x^2
7x=x^2

x=7or0

Thank you so much That makes so much more sense I shouldn't do homework half asleep next time

The math quiz went great, by the way It was so easy! I most likely got 100%, but math's unpredictable. One negative instead of a positive can get the whole answer wrong.

 

[robow87]

57

 

[Eduarda]

58