+0  
 
-1
80
5
avatar+397 

I posted this question before but the screenshot didn't cover it all

 Mar 29, 2020
 #1
avatar+23710 
+2

Look for a coupleof definite points    (2,-2)   and   (4,-8)  are on the graph and easily defined

 

a2 / b  = -2    and    re arrange   a2/-2 = b    (sub this into the next equation)

a4 / b = -8        

                          a^4/  (a^2/-2)  = -8

                          -2a^2 = -8

                              a^2 = 4        a = 2     or -2   (we'll just take the positive root)

 

then b = -2

 

a+b = 2-2 = 0

 Mar 29, 2020
 #2
avatar+397 
-2

This wasn't right

qwertyzz  Mar 29, 2020
 #3
avatar+633 
+1

That doesn't seem so appreciative. Are you even sure you entered the correct number? I graphed it on desmos, and I got the exact same graph in your problem. There doesn't seem to be a problem in his calculations either.

AnExtremelyLongName  Mar 29, 2020
 #4
avatar+397 
+1

I am sure I entered the right number.  I put 0 in and it said it was wrong

qwertyzz  Mar 29, 2020
 #5
avatar+633 
+2

I may have noticed his error. (4, -8) is supposed to be (3, -8). You may use his method and solve it correctly now.

AnExtremelyLongName  Mar 30, 2020

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