Write a polynomial function of least degree with integral coefficients the zeros of which include 4 and 4-i

x³ - 12x² + 49x - 68

Step-by-step explanation:

Complex roots (zeros) occur in conjugate pairs

Thus 4 - i is a zero then 4 + i is a zero

Given the zeros are x = 4, x = 4 ± i, then

the factors are (x - 4), (x - (4 - i)) and (x - (4 + i))

The polynomial is the product of the factors, so

p(x) = (x - 4)(x - 4 + i)(x - 4 - i) ← expand the second pair of factors

      = (x - 4)((x - 4)² - i²) → note i² = - 1

      = (x - 4)(x² - 8x + 16 + 1)

      = (x - 4)(x² - 8x + 17) ← distribute

      = x³ - 8x² + 17x - 4x² + 32x - 68 ← collect like terms

p(x) = x³ - 12x² + 49x - 68

step-by-step explanation:

the first 5 right here the next 5 i will upload as separate question

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: