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# Need help with this Roots and Remainders question! watch

1. How to find numerical difference of equation with complex roots (roots that aren't integers)?
2. (Original post by a_09)
How to find numerical difference of equation with complex roots (roots that aren't integers)?
What do you mean by 'numerical difference of equation' ?
3. (Original post by RDKGames)
What do you mean by 'numerical difference of equation' ?
I really don't know but as far I can understand, they're talking about the difference between the roots of the given quadratic equation.
Here's the question:
The numerical difference between the roots of x^2 -7x-9=0 is:-
i)85^½
ii)9(7^½)
iii)2(85^½)
iv)5
I don't have underroot sign in my keyboard. Sorry if it's confusing you.
4. (Original post by a_09)
I really don't know but as far I can understand, they're talking about the difference between the roots of the given quadratic equation.
Here's the question:
The numerical difference between the roots of x^2 -7x-9=0 is:-
i)85^½
ii)9(7^½)
iii)2(85^½)
iv)5
I don't have underroot sign in my keyboard. Sorry if it's confusing you.
You know a formula for the the two roots of a quadratic equation. Subtract one from the other and what do you get? Now plug in the numbers.
5. (Original post by ghostwalker)
You know a formula for the the two roots of a quadratic equation. Subtract one from the other and what do you get? Now plug in the numbers.
I don't get it. Are you talking about the quadratic formula?
6. (Original post by a_09)
I don't get it. Are you talking about the quadratic formula?
Yes.
7. (Original post by ghostwalker)
Yes.
Oh yess! I got the answer. Thank you!
8. First root = A
Second root = B
Find these using quadratic formula.
Diff between roots = A - B

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