Question

3x³+3x²-3x-3 if x=-2-i​

Answer 1

Answer:-9-3i

Step-by-step explanation:

3x^3+3x^2-3x-3

=3x^2(x+1)-3(x+1)

=(x+1)(3x^2-3)

=(x+1) 3(x^2-1)

=(x+1)3 (x+1)(x-1)

=3(x+2)^2 (x-1)

Now given x=(-2-i)

=3(-2-i+2)^2(-2-i-1)

=3(-i)^2(-3-i)

But i^2=-1

=3(-3-i)

=-9-3i