Question

(1) fx is a root of the quadratic equation kx + 5x -- 21 -0,
then complete the following activity to find the value of k.
One root of the quadratic equation is
substitute x
in the equation.
+ 5
X
15_21 = 0.
..9k +
-- 84 = 0
..9k=
k=​

Answer 1

Answer:

k is -4/5

Step-by-step explanation:

kx+5x-21÷0

putting the value of x

5k+25-21=0

5k+4=0

5k= -4

k= -4/5