solve for x^2 - mx - 5 whose sum of roots is 6. find m.

can any body help me on this ?

thanks

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- January 21st 2013, 06:09 AMrcsvalue of m
solve for x^2 - mx - 5 whose sum of roots is 6. find m.

can any body help me on this ?

thanks - January 21st 2013, 06:28 AMPlatoRe: value of m
- January 21st 2013, 07:35 AMrcsRe: value of m
- January 21st 2013, 02:59 PMPlatoRe: value of m
- January 21st 2013, 03:49 PMSorobanRe: value of m
Hello, rcs!

Quote:

Suppose the two roots are and .

Vieta's formulas tell us: .

. . Therefore: .

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

The equation becomes: .

Quadratic Formula: .

Hence: .

Check:

- January 21st 2013, 10:32 PMrcsRe: value of m
Wow i got it. Thanks.... My god this is magic ... Thanks Sir Soroban