Practice problem
Let aaa be a nonzero real number with a≠1a \not= 1a=1. Simplify: 1a+a+1a−a\frac{1}{a + \sqrt{a}} + \frac{1}{a - \sqrt{a}}a+a1+a−a1
aaa
2a−1\frac{2}{a-1}a−12
a2−aa^2 - aa2−a
2a+1\frac{2}{a+1}a+12
222
Type a concept, like “slope” or “photosynthesis”.