b^2-3b-a=0

Solution for b^2-3b-a=0 equation:

Simplifying
b2 + -3b + -1a = 0

Reorder the terms:
-1a + -3b + b2 = 0

Solving
-1a + -3b + b2 = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '3b' to each side of the equation.
-1a + -3b + 3b + b2 = 0 + 3b

Combine like terms: -3b + 3b = 0
-1a + 0 + b2 = 0 + 3b
-1a + b2 = 0 + 3b
Remove the zero:
-1a + b2 = 3b

Add '-1b2' to each side of the equation.
-1a + b2 + -1b2 = 3b + -1b2

Combine like terms: b2 + -1b2 = 0
-1a + 0 = 3b + -1b2
-1a = 3b + -1b2

Divide each side by '-1'.
a = -3b + b2

Simplifying
a = -3b + b2