Which of the following is a polynomial with roots 5, 7, and −8? f(x) = x3 − 35x2 − 56x + 61 f(x) = x3 − 35x2 − 61x + 280 f(x) = x3 − 4x2 − 35x + 56 f(x) = x3 − 4x2 − 61x + 280

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Which of the following is a polynomial with roots 5, 7, and −8? f(x) = x3 − 35x2 − 56x + 61 f(x) = x3 − 35x2 − 61x + 280 f(x) = x3 − 4x2 − 35x + 56 f(x) = x3 − 4x2 − 61x + 280

Algebra
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f(x) = (x-5)(x-7)(x+8) = (x-5)(x^2+x-56) = x^3+x^2-56x-5x^2-5x+280 f(x) = x^3-4x^2-61x+280 So the answer is d
how did you do that so fast

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Other answers:

are you super man?
cause this stuff is easy
i can do pre calculus in 7th grade
i am only 12 fyi
so you are super man
mind helping me with one more
however - @OregonDuck all oyu have given the poster is the knowledge that YOU can solve this question what iwould be truly helpful would be to show HOW to solve it - then let HIM do the work you learn better by DOING than by watching
sure :)
Which of the following is a polynomial with roots 4, 2i, and −2i? f(x) = x3 − 4x2 + 8x − 4 f(x) = x3 − 8x2 + 16x − 4 f(x) = x3 − 4x2 + 4x − 16 f(x) = x3 − 4x2 + 8x − 16
wait!
WHAT?!?
if the roots are a,b & c then the factors are (x-a)(x-b)(x-c) if you put your three roots into that formula then mutiply out the 23 brackets you will come to the answer YOURSELF
Work backwards for each root to get the factor.. (x - 4)(x - 2i)(x + 2i) Distribute.. (x - 4)(x² - 4i²) = (x - 4)(x² + 4) [Noting that i² = -1] = x³ - 4x² + 4x - 16 [A]
if the roots are a,b & c then the factors are (x-a)(x-b)(x-c) if you put your three roots into that formula then mutiply out the 3 brackets you will come to the answer YOURSELF
ya i got that to
it is a
wait no it is c sorry i was reading mine post i put a for some reason lol
@OregonDuck Once again - juist showing that YOU know how to do this type of questin. LET the poster do some of the calculation - he will actually LEARN from that instead of copying
im working it out as well mrnood
he will learn my failing the dba or segment exams cause you need your notes and memory to help you
i am taking these problems down as notes
so i can learn to do the harder ones
EXACTLY SEE ^^^^^^^^
but until you do one yourself you will not be sure that oyu UNDERSTAND how to do it you do not need to learn 'harder' questions - you need to learnt the METHOD - then oyu can do ALL questions
i did 8 out of the 10 of my practice questions @MrNood but just needed help for these two
FINE ASK HIM FOR HELP NOT ME AL LEAST I SHOWED MY WORK!!!!!!!
Please dont fight @OregonDuck and @MrNood
Don't get in a sulk Just try to help posters to learn rather than going right through to tthe answer
thank you @MrNood and @OregonDuck
yeah your welcome
YOU'RE welcome

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