Solve for a when f(a)=2=1/(sqr(1-a)) Multiply both sides of the equation by sqr(1-a). Thsi implies,
2sqr(1-a)=1 Square both sides.
Edward, it is good to get into the habit to get rid of the radical in the denominator of the fraction. Multiply both the numerator and denominator by √3 in which is.
2/√3*√3/√3=2√3/3=2/3*√3. Note: 2/3*√3 seems easier to see the answer then 2/√3.