3 years ago

15 Points!

1 answer:

6 0

$5; -3; -1 -2i$
In polynomials we have not of an imaginary unit (i), therefore we have the fourth zeros -1-2i.

$f(x)=(x-5)(x+3)\left[x-(-1-2i)\right]\left[x-(-1+2i)\right]\\\\=(x^2+3x-5x-15)[x^2-x(-1+2i)-x(-1-2i)+(-1)^2-(2i)^2]\\\\=(x^2-2x-15)(x^2+x-2i+x+2i+1+4)\\\\=(x^2-2x-15)(x^2+2x+5)\\\\=x^4+2x^3+5x^2-2x^3-4x^2-10x-15x^2-30x-75\\\\=x^4-14x^2-40x-75$

Answer: B)

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4 years ago

Can someone find out the answer to this question please, in the image below

Alik [6]

I can see why your confused, but the range of the function is y≤−1 or y≥1 . The graph of the cotangent function looks like this: The domain of the function y=cot(x)=cos(x)sin(x) is all real numbers except the values where sin(x) is equal to 0 , that is, the values πn for all integers n .

Hope this helps

Have a great day!

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