Let r and s be the roots of the quadratic x^{2 }+ bx + c where b and c are constant, if (r-1)(s-1) = 7 find b + c

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- Aug 1st 2012, 04:14 PMmgmanojQuadratic equation
Let r and s be the roots of the quadratic x

^{2 }+ bx + c where b and c are constant, if (r-1)(s-1) = 7 find b + c - Aug 1st 2012, 08:31 PMProve ItRe: Quadratic equation
- Aug 2nd 2012, 04:11 AMmgmanojRe: Quadratic equation
Thanks - I was half way down to the problem - but did not substitute - this confirms my theory. Thanks again.

- Aug 2nd 2012, 09:14 AMSorobanRe: Quadratic equation
Hello, mgmanoj!

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- Aug 2nd 2012, 09:19 AMrichard1234Re: Quadratic equation
I second Soroban's solution...always helps to look at the sum and product of the roots of the quadratic.

- Aug 2nd 2012, 04:26 PMWilmerRe: Quadratic equation