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+0  
 
+1
395
5
avatar+1438 

Thanks so much :D

 

Edit: Fast help would be GREATLY appreciated! 

 Dec 20, 2017
edited by AnonymousConfusedGuy  Dec 20, 2017
 #1
avatar+104712 
+1

If f(x)  = 10....we have that

 

x^2  +  9  =  10       subtract  10 from both sides

 

x^2  -1  = 0       factor

 

(x + 1) (x - 1)  = 0      set each  factor to 0 and solve for x and we get that

 

x  = 1   or   x  = -1

 

But only the second answer is in the domain

 

Also

 

3x  -  8  =  10   subtract  10 from both sides

 

3x  - 18  = 0     factor

 

3(x  - 6)  = 0       divide both sides by 3

 

 x - 6  = 0       add 6 to both sides

 

x  = 6       and this is in the domain

 

So....possible  values of x are   -1   and   6

 

 

cool cool cool

 Dec 20, 2017
 #2
avatar+1438 
+2

Sorry, but that would make the sum 5 and 5 isn't right... Am I missing something?

AnonymousConfusedGuy  Dec 20, 2017
 #3
avatar+104712 
0

Sorry, ACG....only x =   6 is correct.....x  = -1 as an answer to the first one isn't in the domain, either....

 

cool cool cool

 Dec 20, 2017
 #4
avatar+1438 
+2

Oh ok thanks! I'm stupid...

AnonymousConfusedGuy  Dec 20, 2017
 #5
avatar+104712 
0

No you aren't....I should pay more attention to my answers.....LOL!!!

 

 

cool cool cool

 Dec 20, 2017

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