To remove the radical on the left side of the equation, square both sides of the equation.
Simplify each side of the equation.
Multiply the exponents in ((a-1)12)2.
Apply the power rule and multiply exponents, (am)n=amn.
Cancel the common factor of 2.
Cancel the common factor.
Rewrite the expression.
Raise 3 to the power of 2.
Move all terms not containing a to the right side of the equation.
Add 1 to both sides of the equation.
Add 9 and 1.
Solve for a square root of a-1=3