Find the missing number or expression in the pair of equivalent fractions. Assume that all denominators are nonzero. $$\frac { a - 5 } { a + 5 } , \frac { ? } { a ^ { 2 } + 10 a + 25 }$$
A) $a ^ { 2 } - 5$
B) $a ^ { 2 } + 25$
C) $a ^ { 2 } + 5$
D) $a ^ { 2 } - 25$
E) $a ^ { 2 } - 20$

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The Answer of Find the missing number or expression in the pair of equivalent fractions. Assume that all denominators are nonzero. $$\frac { a - 5 } { a + 5 } , \frac { ? } { a ^ { 2 } + 10 a + 25 }$$
A) $a ^ { 2 } - 5$
B) $a ^ { 2 } + 25$
C) $a ^ { 2 } + 5$
D) $a ^ { 2 } - 25$
E) $a ^ { 2 } - 20$

Find the Missing Number or Expression in the Pair of Equivalent