To make b the subject in the equation a = √(b+2/5), we need to isolate b on one side of the equation.
Step 1: Start with the given equation: a = √(b+2/5).
Step 2: Square both sides of the equation to eliminate the square root: (a)^2 = (√(b+2/5))^2.
Step 3: Simplify the right side of the equation: a^2 = b + 2/5.
Step 4: Subtract 2/5 from both sides of the equation to isolate b: a^2 - 2/5 = b.
Therefore, b is the subject of the equation and can be written as b = a^2 - 2/5.