Question

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If a polynomial function f(x) has roots -9 and 7-i, what must be a factor of f(x)?
O (x-(7 + 1))
O (x-(-7-1))
O (x + (7 + 1))
0 (x + (7-1))

Answer 1

Hi,

Answer B: x-7+i= (x-(7-i))

Explanation:

a polynomial function f(x) has roots -9 and 7-i

`f(x)=(x+9)(x-(7-i))=(x+9)(x-7+i)\\\\`

Answer B if we read the one as i