Question

AP. (1, x), (5, 2),(9,5) are collinear then find the value of x

Answer 1

Please find the attached file for your query

Answer 2

1/2(1/x*5/2*9/5*1/x)=0
1/2[(2+25+9x)-(5x+18+5)]
1/2(27+9x-5x-23)
1/2(4+4x)=0
4+4x=0
4x=-4
x=-4/4
x=-1
I think so this will be correct