## Tati_Lee Group Title Which of the following is the simplified form of one year ago one year ago

1. Tati_Lee

$\frac{ x ^{2}-16 }{ x-4 }$

2. Tati_Lee

x + 4, with the restriction x ≠ –4 x – 4, with the restriction x ≠ –4 x + 4, with the restriction x ≠ 4 x – 4, with the restriction x ≠ 4

3. Zekarias

can you factorize $x^{2}-16$??????????????????

4. Tati_Lee

(x+4)(x-4)?

5. Zekarias

oh sorry $\frac{ (x+4)(x-4) }{ x-4 }$Thus which cancels which?

6. Tati_Lee

x-4 cancels

7. Zekarias

But $x-4\neq0......x{\neq}4$right?

8. Tati_Lee

im confused

9. Zekarias

If you have rational expression like a/b, b must not be 0 so as the given expression above to be rational. You this?

10. Zekarias

you know this?

11. Tati_Lee

yea

12. Zekarias

Therefore the expression$\frac{ (x+4)(x-4) }{ x-4 }$ to be rational, what condition must be fulfilled?

13. Zekarias

Are you there?