The expression `(x^2 - 16)/(x^2 + 8x + 16)` has to be simplified.
`(x^2 - 16)/(x^2 + 8x + 16)`
= `((x - 4)(x + 4))/(x + 4)^2`
= `(x - 4)/(x + 4)`
The required form in lowest terms is `(x - 4)/(x + 4)`
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