Question

if ( x-2) is a factor of x2-3ax-7 then find the value of a

Answer 1

(x-2)=0 x=2
put x=2
x^2-3ax-7=0
4-6a-7=0
a= -(1/2)

Answer 2

x-2 = 0
x= 2
p(x)=2

2^-3a(2)-7
4- 6a-7=0
-3-6a = 0
-6a= 3
a= 3/6
a= -2