Question

(iii) Which of the following is the value of k, if one root of the quadratic
(A) 635
is – 4?
(C) 0 or 4
(B) 4
(D) 2
(A) 0​

Answer 1

Answer:

not understand this question sorry

Answer 2

Given equation is y=(3k+1)x

2

+2(k+1)x+1=0

Also, it is given that the equation has equal roots.

Then D=0⇒b

2

−4ac=0

a=3k+1 b=2(k+1) c=1

b

2

−4ac=[2(k+1)]

2

−4(3k+1)=0

⇒4k

2

+4+8k−12k−4=0

⇒4k

2

−4k=0

⇒4k(k−1)=0

⇒k=0 k=1

When k=0

equation y=x

2

+2x+1=0

Roots are x=−1,−1

When k=1

equation 4x

2

+4x+1=0

Roots are x=

2

−1

,

2

−1