Question

If (x + 2) is a factor of x3 – 19x – p, find the value of p. Help please​

Answer 1

If
`x-a` is a factor of a polynomial
`P(x)` then,
`a` is its root.

So
`-2` is a root of
`x^3-19x-p`

`(-2)^3-19\cdot(-2)-p=0\\-8+38-p=0\\p=30`