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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Originally Posted by mgmanoj 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 So we can say and . Since we know , we can say
Thanks - I was half way down to the problem - but did not substitute - this confirms my theory. Thanks again.
Hello, mgmanoj!
I second Soroban's solution...always helps to look at the sum and product of the roots of the quadratic.
Originally Posted by richard1234 I second Soroban's solution...always helps to look at the sum and product of the roots of the quadratic. I third it !
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