anonymous
  • anonymous
Which of the following represents the zeros of f(x) = x3 − 5x2 − 3x + 15? 5, square root of 3, −square root of 3 −5, −square root of 3, −square root of 3 5, −square root of 3, −square root of 3 −5, square root of 3, square root of 3
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Jhannybean
  • Jhannybean
\[f(x) = x^3-5x^2-3x+15=0\]\[f(x) = x^2(x-5) +3(x-5) = 0\]\[f(x) = (x^2+3)(x-5)=0\]\[x^2+3=0 \qquad x=~?\]\[x-5=0 \qquad x=~?\]
anonymous
  • anonymous
X=-3 X=5
Jhannybean
  • Jhannybean
You've got one right

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More answers

anonymous
  • anonymous
X^2=-3?
Jhannybean
  • Jhannybean
\[x^2+3=0 \implies x^2=-3\]\[x= \pm i\sqrt{3}\]Your answer choices are kind of weird.
anonymous
  • anonymous
so its A then right
Jhannybean
  • Jhannybean
Oh I think Im the one that made the mistake.
anonymous
  • anonymous
wait how
ParthKohli
  • ParthKohli
yes it's x^2 - 3
anonymous
  • anonymous
so it would still be A then right
ParthKohli
  • ParthKohli
ya
anonymous
  • anonymous
ok thank you
anonymous
  • anonymous
do you mind helping me with one more?
anonymous
  • anonymous
@Jhannybean @ParthKohli
Jhannybean
  • Jhannybean
correction: \((x^2-3)(x-5)=0\)
Jhannybean
  • Jhannybean
It wouldnt let me post. -_-
ParthKohli
  • ParthKohli
i know that feel
anonymous
  • anonymous
Which of the following represents the zeros of f(x) = x3 − 14x2 + 61x − 84? 7, 4, −3 7, 4, 3 7, −4, −3 7, −4, 3
anonymous
  • anonymous
i believe it would be B
ParthKohli
  • ParthKohli
Look at the choices. We know that \(7\) is definitely a zero. Divide the thing by \(x - 7\). The remaining is a quadratic polynomial that can be factored.
ParthKohli
  • ParthKohli
or just plug in the choices lol idk who cares
ParthKohli
  • ParthKohli
Vieta's Formulas @Jhannybean :)
anonymous
  • anonymous
(x - 3) • (x - 4) • (x - 7)
anonymous
  • anonymous
i got this
anonymous
  • anonymous
so would it be B
Jhannybean
  • Jhannybean
=__=.... VF. How would that work here? we have one root = \((x-7)\) Then we'd find \(\alpha +\beta \) and \(\alpha\beta\) ?
Jhannybean
  • Jhannybean
@ParthKohli darn it you logged.
anonymous
  • anonymous
@ganeshie8
anonymous
  • anonymous
srry i have to go
Jhannybean
  • Jhannybean
Np :)

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