Use the quadratic equation to get an expression for the two roots of the equation, and set the difference between them equal to two:
subtract, and set equal to 2:
Now solve for a - square both sides, rearrange, and use the quadratic formula.
Use the quadratic equation to get an expression for the two roots of the equation, and set the difference between them equal to two:
subtract, and set equal to 2:
Now solve for a - square both sides, rearrange, and use the quadratic formula.