Q.1 Find the values of K so that the quadratic equationx^2+2(K+1)x+K+5=0 has at least one positive root.?
1 Answer
Aug 25, 2017
Explanation:
A quadratic equation basic formula is
so matching up with
gives
constants:
For a quadratic to have at least one positive root, the discriminate
From the quadratic formula, the discriminate is
So in this case,
So if K=4 then
It seems like we need the c part to cancel. So if
the equation would be
8 is +ve so K=-5 must be the solution.