Tati_Lee
Which of the following is the simplified form of



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Tati_Lee
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\[\frac{ x ^{2}16 }{ x4 }\]

Tati_Lee
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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

Zekarias
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can you factorize \[x^{2}16\]??????????????????

Tati_Lee
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(x+4)(x4)?

Zekarias
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oh sorry \[\frac{ (x+4)(x4) }{ x4 }\]Thus which cancels which?

Tati_Lee
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x4 cancels

Zekarias
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But \[x4\neq0......x{\neq}4\]right?

Tati_Lee
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im confused

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

Zekarias
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you know this?

Tati_Lee
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yea

Zekarias
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Therefore the expression\[\frac{ (x+4)(x4) }{ x4 }\] to be rational, what condition must be fulfilled?

Zekarias
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Are you there?