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Help! I tried plugging in numbers.... pls help

🙏🙏🙏

-\(tommarvoloriddle\)

 Jul 7, 2019
edited by tommarvoloriddle  Jul 7, 2019
edited by tommarvoloriddle  Jul 7, 2019
 #1
avatar+625 
+3

NVM! I solved this question by solving for x, thank you for helping, melody!

 Jul 7, 2019
 #2
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Here is the graph

 

https://www.desmos.com/calculator/7r6zlevfrv

Using the graph can you see what the answer is?

 

You also need to be able to work these out without graphing first (it is good to graph afterwards for checking you answer)

 

X^2 is always going to be positive.  

x can't be 1

 

Do you know how to use calculus Tom?

If so it is easy just to differentiate and then set y'=0 to find the stationary points etc.

 Jul 7, 2019
 #3
avatar+625 
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what caculus? uhhh NO im in 8th GRADE! Im supposed to be in 6th!

tommarvoloriddle  Jul 7, 2019
 #4
avatar+102447 
+1

ok, no worries, how did you do it?

Melody  Jul 7, 2019
 #5
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It doesn't actually matter what the solution to this quadratic is. The only thing that is important is that we find all values  such that this quadratic (in ) has a real solution. For that we look at the discriminant.

 

 

We see that we can only find a suitable value of x if \( y^2 + 4y \ge 0\)

tommarvoloriddle  Jul 7, 2019
edited by tommarvoloriddle  Jul 7, 2019
 #6
avatar+102447 
+1

Huh??

Melody  Jul 7, 2019
 #7
avatar+625 
0

what i did...

tommarvoloriddle  Jul 7, 2019
 #8
avatar+102447 
+1

You need to use more explanation, I have no idea what you are talking about.

Melody  Jul 7, 2019
 #9
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blush ok, so i figured that you didn't need to solve for x... whoops... and you could use the dicriminant...

tommarvoloriddle  Jul 7, 2019

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