Question

if x2+ 2 k x + 4 = 20 find the value of k​

Answer 1

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x² + 2kx + 4 = 20

x² + 2kx = 20 - 4 = 16

2kx = 16 - x²

$\boxed{k = \frac{16 - {x}^{2} }{2x} }$

If the value of x is given you can apply it in value of k.

Answer 2

Answer:

k=8/X -1

Step-by-step explanation:

2x + 2kx + 4 = 20

2x + 2kx = 16

2x(1+k)= 16

(1+k) = 16/2x

k = 8/x -1