Question

if the root of quadratic equation kx square - 7 x + 12 is equal to zero is 3 find the value of k​

Answer 1

Answer:k= 1

Step-by-step explanation:

Please see in attachment

Answer 2

X=3

kx^2 -7x +12 =0 comparing equation with ax^2 +bx +c =0

a = k , b = -7 , c = 12

b^2 -4ac = (-7)^2 - 4 k( 12)

= 49 - 48k

but , b^2 - 4ac =0

49 - 48 k = 0

-48k = -49

48k = 49

k = 49 /48