Question

If x^2+√2x-4=0 , then the discriminant D = _______.
(A) -18
(B) 18
(C) 6
(D) 10​

Answer 1

Step-by-step explanation:

D=0

b2−4ac−−−−−−−√=0D=0

Here,b=2(k-3), a=(k-4) ,c=4

Putting these values we get,

2(k−3)2−4(k−4)(4)=0

Simplifying we get,

k2−10k+25=0

k=10±100−4(25)√2

=5