Question

table starts with interval of 9 12 15 minutes respectively if the starting tolling together after what time will the next toll together

Answer 1

After 3 hrs they will toll together

Answer 2

X + 1 = 0

X = 0 - 1

X = -1

Let,

P (X) = xcube + xsq - X - 1

P(-1 ) = (-1 )cube + (-1 )sq - (-1 ) - 1

= -1 + 1 + 1 - 1

= 0

Therefore,

X + 1 is a factor of p(x).