Question

1.
If (x-2) is a factor of x2 - ax + 4,then the value of 'a' is
a) 4
b) 2
c) - 4
d) - 2
1.​

Answer 1

4

Step-by-step explanation:

(2)^2 - a(2) +4 =0 => a = 4

Answer 2

Step-by-step explanation:

f(x)= x²-ax+4

if (x-2) is a factor of f(x) then f(2)=0 [as x-2=0 or x=2]

f(2)= (2)²- a(2) +4

= 4-2a+4

= 8-2a

now, 8-2a=0

or 2a=8

or a=8/2

or a=4