If I want to enter this into quadratic formula, do I need to change it someway? The coefficients are in fractions and that's what confuses me.
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Hi reallylongnicknam. put the equation into this form a^2 +bx +C = 0 bjh
Firstly, multiple both sides by (s+5)(s-5). What do you get?
I'm thinking there is cross multipling with those 90s.
Last edited by reallylongnickname; Mar 30th 2011 at 07:28 PM.
I mean What do you get?
Good, now expand each term and group where they are like. What do you get?
Originally Posted by reallylongnickname OK so far...continue...easier if you change 2 1/8 to 17/8
Would I divide all coefficients by 8 to remove the fraction before I can plug this into the quadratic formula?
Last edited by reallylongnickname; Mar 31st 2011 at 04:36 AM.
You don't have to: a, b, and c in " " don't have to be integers but you will probably find the arithmetic easier.
Originally Posted by reallylongnickname That is not correct. 90(S - 5) + 90(S + 5) = 180S 17/8(S - 5)(S + 5) = 17/8(S^2 - 25) So: (17/8)S^2 - (17/8)25 - 180S = 0 17S^2 / 8 - 180S - 425 / 8 = 0 Multiply by 8: 17S^2 - 1440S - 425 = 0 OK?
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