Question

the quadratic equation X square - 4 x + k equal to zero has real roots if​

Answer 1

Answer:

If the equation has real roots then,

b2-4ac=0

(-4)2-4×1×k=0

16-4k=0

-4k=-16

k=4

Step-by-step explanation:

I hope this answer may help you

Answer 2

Answer: 4 ≥ k or -infinity < k ≤ 4

Step-by-step explanation:

For real roots, b^2 - 4ac should be greater than or equal to 0, hence ((-4)^2)-4(k)(1) ≥ 0

=> 16-4k ≥ 0

=> 16 ≥ 4k

=> 4 ≥ k