if 3x+k,2x+9 and x+13 are three consecutive terms of an AP.,Find k.
=>(2x+9)-(3x+k)=(x+13)-(2x+9)
=>2x-3x+9-k=x-2x+13-9
=>-x+9-k=-x+4
=>9-k=4
=>-k=4-9
=>-k=-5
=>k=5 ans.
hope u understand
if 3x+k,2x+9 and x+13 are three consecutive terms of an AP.,Find k.
=>(2x+9)-(3x+k)=(x+13)-(2x+9)
=>2x-3x+9-k=x-2x+13-9
=>-x+9-k=-x+4
=>9-k=4
=>-k=4-9
=>-k=-5
=>k=5 ans.
hope u understand