Use the Factor Theorem to determine whether x-3 is a factor of P(x)=x³-4x²-7. Specially evaluate P at the proper value, and then determine whether x-3 is a factor

Answer 1

If (x-3) is a factor of P(x), then 3 must be a root of P(x), i.e. P(3) must equal 0. If P(3) does not equal 0, then (x-3) is not a factor.

P(3) = (3)³-4(3)²-7 = ?