madmerc
  • madmerc
Which of the following represents the zeros of f(x) = x3 − 4x2 − 5x + 20?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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DanJS
  • DanJS
f(x) = 0 x-axis intercepts
DanJS
  • DanJS
looks like one of those where you can regroup things, and factor it
madmerc
  • madmerc
the choices are −4, −square root of 5, −square root of 5 4, square root of 5, −square root of 5 4, −square root of 5, −square root of 5 −4, square root of 5, square root of 5

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More answers

madmerc
  • madmerc
i don't understand how to get to those
DanJS
  • DanJS
[x^3 - 5x] - 4x^2 + 20 both of those pairs have a common factor x*(x^2 - 5) - 4 * (x^2 - 5)
DanJS
  • DanJS
so you can then factor that now, take x^2 -5 from both = (x^2 - 5) * ( x - 4 )
madmerc
  • madmerc
what do I do after that? @DanJS
AihberKhan
  • AihberKhan
That is it.
AihberKhan
  • AihberKhan
The answer is: \[(x^2-5)(x-4)\] and @DanJS Is now offline.
AihberKhan
  • AihberKhan
Hope this helped! Have a great day! Also a medal would be much appreciated! Just click best response next to my answer. Thank You! @madmerc
madmerc
  • madmerc
@AihberKhan that isn't one of the choices though..
madmerc
  • madmerc
The answer was 4, square root of 5, −square root of 5
mathmate
  • mathmate
hint: use identity: a^2-b^2=(a+b)(a-b). So if \((x^2-7)=0\), we have \((x^2-(\sqrt 7)^2)=(x+\sqrt 7)(x-\sqrt 7)=0 ~~~=>~~~ x=\sqrt 7~or~ x=-\sqrt 7\)

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