anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@MrNood @OregonDuck
OregonDuck
  • OregonDuck
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
anonymous
  • anonymous
how did you do that so fast

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More answers

anonymous
  • anonymous
are you super man?
OregonDuck
  • OregonDuck
cause this stuff is easy
OregonDuck
  • OregonDuck
i can do pre calculus in 7th grade
OregonDuck
  • OregonDuck
i am only 12 fyi
anonymous
  • anonymous
so you are super man
anonymous
  • anonymous
mind helping me with one more
MrNood
  • MrNood
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
OregonDuck
  • OregonDuck
sure :)
anonymous
  • anonymous
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
MrNood
  • MrNood
wait!
OregonDuck
  • OregonDuck
WHAT?!?
MrNood
  • MrNood
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
OregonDuck
  • OregonDuck
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]
MrNood
  • MrNood
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
anonymous
  • anonymous
ya i got that to
OregonDuck
  • OregonDuck
it is a
OregonDuck
  • OregonDuck
wait no it is c sorry i was reading mine post i put a for some reason lol
MrNood
  • MrNood
@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
anonymous
  • anonymous
im working it out as well mrnood
OregonDuck
  • OregonDuck
he will learn my failing the dba or segment exams cause you need your notes and memory to help you
anonymous
  • anonymous
i am taking these problems down as notes
anonymous
  • anonymous
so i can learn to do the harder ones
OregonDuck
  • OregonDuck
EXACTLY SEE ^^^^^^^^
MrNood
  • MrNood
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
anonymous
  • anonymous
i did 8 out of the 10 of my practice questions @MrNood but just needed help for these two
OregonDuck
  • OregonDuck
FINE ASK HIM FOR HELP NOT ME AL LEAST I SHOWED MY WORK!!!!!!!
anonymous
  • anonymous
Please dont fight @OregonDuck and @MrNood
MrNood
  • MrNood
Don't get in a sulk Just try to help posters to learn rather than going right through to tthe answer
anonymous
  • anonymous
thank you @MrNood and @OregonDuck
OregonDuck
  • OregonDuck
yeah your welcome
MrNood
  • MrNood
YOU'RE welcome

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