Factor x3 + x2 + x + 1 over the complex numbers.

(x+1)(x+i)(x-i)

Step-by-step explanation:

x3 + x2 + x + 1

Group factor:  x2(x+1) + (x+1)

= (x+1)(x2 + 1) = (x+1)(x+i)(x-i)

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

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times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3