Polynomial with real coefficients always has even number of complex roots. We know that one of them is 2 + 5i so the second one will be 2 - 5i and:

$f(x)=\big(x-4\big)\big(x-(-8)\big)\big(x-(2+5i)\big)\big(x-(2-5i)\big)=\\\\=(x-4)(x+8)(x-2-5i)(x-2+5i)=\\\\=(x^2-4x+8x-32)(x^2-2x+5ix-2x+4-10i-5ix+10i-25i^2)\\\\=\big(x^2+4x-32\big)\big(x^2-4x+4-25\cdot(-1)\big)=\\\\=(x^2+4x-32)(x^2-4x+29)=\\\\=x^4-4x^3+29x^2+4x^3-16x^2+116x-32x^2+128x-928=\\\\=\boxed{x^4-19x^2+244x-928}$

Answer B.

8 0

2 years ago

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Use your knowledge of transformations to find the

liberstina [14]

Answer:

D B A C

Step-by-step explanation:

5 0

2 years ago

A thermodynamic analysis of a proposed brayton cycle gas turbine yields p=5 mw of net power production

lina2011 [118]

The Brayton cycle is a thermodynamic cycle named after George Bailey Brayton that describes the workings of a constant pressure heat engine. The original Brayton engines used a piston compressor and piston expander, but more modern gas turbine engines and air breathing jet engines also follow the Brayton cycle.

4 0

3 years ago

Rafael counted a total of 40 white cars and yellow cars there were 9 times as many white cars as yellow how many white cars did

Paladinen [302]

Answer:

Uhhhh si he counted 40 cars so just do 40 times 9 which is 360

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2 years ago

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