Question

Solve with quadratic formula. 4k^2- 20 = k

Answer 1

Answer: $k= \frac{1+\sqrt{321} }{8} , \frac{1-\sqrt{321} }{8}$

Step-by-step explanation:

Move all terms to one side.

$4^{2} -20-k=0$

Use the Quadratic Formula.

$k=\frac{1+\sqrt{321} }{8}$ , $k=\frac{1-\sqrt{321} }{8}$

Answer 2

Step-by-step explanation:

4k² - 20 = k

4k² - k - 20 = 0

By quadratic formula :

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

x =( 1 ± √80 ) / 8

x = (1 ± 4√5)/8