Question

if the eqution
x2- Kx+1=0, has no real roots,
a) k<-2
b) k>2
d None
C) -2<k < 2​

Answer 1

Step-by-step explanation:

• It is given that the discriminant is less than zero ( has no real roots )
• D = b^2 - 4ac
• = (-k)^2 - 4(1) ( 1 ) < 0
• = (-k )^2 - 4 <0
• = k^2 < 0+4
• = k < √ 4
• = k < +- 2
• = -2 > k < 2
• therefore the option is d) none

Answer 2

Kx+1=0, has no real roots,

a) k<-2

b) k>2

d None

C) -2<k < 2