Hi,

I would appreciate any help with the following question.

Given that the roots of the equation x² + ax + (a + 2) = 0 differ by two, find the possible values of constant a.

Printable View

- July 3rd 2013, 11:01 AMSeaniboyRoots of a Quadraitc Equation
Hi,

I would appreciate any help with the following question.

Given that the roots of the equation x² + ax + (a + 2) = 0 differ by two, find the possible values of constant a.

- July 3rd 2013, 11:29 AMebainesRe: Roots of a Quadraitc Equation
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. - July 3rd 2013, 04:19 PMHallsofIvyRe: Roots of a Quadraitc Equation
Another way: so if and are roots of then we must have and . Knowing also that "the roots of the equation x² + ax + (a + 2) = 0 differ by two", so that , we have three equations to solve for the three values, , , a.

- July 4th 2013, 01:35 PMSeaniboyRe: Roots of a Quadraitc Equation
Hi,

Thanks very much for your help.

Much appreciated. - July 4th 2013, 02:09 PMSeaniboyRe: Roots of a Quadraitc Equation
Thanks a lot for your help.