If 2x2 - kx - 12 is divisible by x-4, Find the value...
If 2x2 - kx - 12 is divisible by x-4, Find the value of k.
4
5
6
7
Correct answer is B
2x2 - kx - 12 is divisible by x-4
implies x is a factor ∴ x = 4
f(4) implies 2(4)2 - k(4) - 12 = 0
32 - 4k - 12 = 0
-4k + 20 = 0
-4k = -20
k = 5