If the points 2^i+4^J,7^i+x^j,−^i+^J are collinear, then the value of x is
6
7
8
9
A=(2, 4) B=(7, x) C=(-1,1) given that A, B, C are cillinear dr’s of AB = dr’s of AC ⇒5x−4=1⇒x=9