Rewrite the expression using only positive exponents, and simplify. Assume that any variables in the expression are nonzero. $s−1+r−1s−1−r−1\frac { s ^ { - 1 } + r ^ { - 1 } } { s ^ { - 1 } - r ^ { - 1 } }$

A) $r−sr+s\frac { r - s } { r + s }$
B) $s ^ { 2 } + r ^ { 2 }$
C) $r+sr−s\frac { r + s } { r - s }$
D) $s+rs−r\frac { s + r } { s - r }$
E) $s−rs+r\frac { s - r } { s + r }$

Question

Rewrite the expression using only positive exponents, and simplify. Assume that any variables in the expression are nonzero.

s−1+r−1s−1−r−1\frac { s ^ { - 1 } + r ^ { - 1 } } { s ^ { - 1 } - r ^ { - 1 } }

A)

r−sr+s\frac { r - s } { r + s }

B)

s ^ { 2 } + r ^ { 2 }

C)

r+sr−s\frac { r + s } { r - s }

D)

s+rs−r\frac { s + r } { s - r }

E)

s−rs+r\frac { s - r } { s + r }

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