Question

Find the value of k for which the equation 5x^2-kx+1=0 has real roots

Answer 1

the formula is b^2-4ac=0 then {-k}^2-4.5.1=0,k^2=20, k=+{20}^1/2 or {-20}^1/2

Answer 2

Answer:

-20^ 1/2..........ans