Question

k^2 - 4k - 1

PLEASE FACTORISE IT AND FIND K​

Answer 1

Answer:

Step-by-step explanation:

something  is wrong in question you should check

Answer 2

Answer:

${x}^{2} - 4x - 1$

$=x = \frac{ - b + \sqrt{ {b}^{2} - 4ac } }{2a} = \frac{ - ( - 4) + \sqrt{ { (- 4)}^{2} - 4 \times 1 \times ( - 1)} }{2 \times 1}$

$= \frac{ 4 + \sqrt{16+ 4}}{2}$

$=\frac{4 + \sqrt{20} }{2} = \frac{4 + 2 \sqrt{5} }{2} = \frac{2(2 + \sqrt{5})}{2} = 2 + \sqrt{5}$

Also,

$x = \frac{ - b - \sqrt{ {b}^{2} - 4ac} }{2a} = 2 - \sqrt{5}$

So, the value of k,

$2 + \sqrt{5} \: or \: 2 - \sqrt{5}$

Hope it helps you.