+0

# Last problem! For now...

0
62
5
+403

Thanks so much :D

Edit: Fast help would be GREATLY appreciated!

AnonymousConfusedGuy  Dec 20, 2017
edited by AnonymousConfusedGuy  Dec 20, 2017
Sort:

#1
+81022
+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

CPhill  Dec 20, 2017
#2
+403
+1

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

AnonymousConfusedGuy  Dec 20, 2017
#3
+81022
0

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

CPhill  Dec 20, 2017
#4
+403
+1

Oh ok thanks! I'm stupid...

AnonymousConfusedGuy  Dec 20, 2017
#5
+81022
0

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

CPhill  Dec 20, 2017

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