KJ4UTS
  • KJ4UTS
The function f(x)=2x^3-4x+1 has the output value 12 for exactly one input value of x. Between which of the following pairs of numbers does this input value of x lie? 2.08 and 2.09 2.10 and 2.11 2.12 and 2.13 2.14 and 2.15 2.16 and 2.17 2.19 and 2.20 None of the above Please explain. Thank you!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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KJ4UTS
  • KJ4UTS
How do I do this do I plug the numbers in?
Hero
  • Hero
By plugging them in for x
KJ4UTS
  • KJ4UTS
So plug in for example 2(2.08)^3-4(2.08)+1=10.68 and then 2(2.09)^3-4(2.09)+1=10.89

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More answers

Hero
  • Hero
Keep trying until you get close enough to the exact value.
KJ4UTS
  • KJ4UTS
for 2(2.14)^3-4(2.14)+1 I got 12.04 and 2(2.15)^3-4(2.15)+1 I got 12.28
Hero
  • Hero
Keep trying until you get close enough without going over.
KJ4UTS
  • KJ4UTS
and then for 2.16 and 2.17 I got 12.51 - 12.76
KJ4UTS
  • KJ4UTS
@hero so what would it be?
KJ4UTS
  • KJ4UTS
@hero or is it none of the above
Hero
  • Hero
Why'd you skip 2.09 thru 2.13
KJ4UTS
  • KJ4UTS
@hero I did those but those were closer to 12 2.08 and 2.09 = 10.68 - 10.89 2.10 and 2.11 = 11.12 - 11.81 2.12 and 2.13 = 11.58 - 11.81
Hero
  • Hero
Try 2.13-2.14
Hero
  • Hero
And that should let you know what the answer is
KJ4UTS
  • KJ4UTS
but that's not a choice
KJ4UTS
  • KJ4UTS
@hero 11.81 - 12.04 i seen someone mention online that "The easiest way to do this is probably to try each pair of numbers and see which one gives numbers on either side of 12." which is what we have been doing but what does it mean by either side of 12?
Hero
  • Hero
"above or below" 12
Hero
  • Hero
on a number line
KJ4UTS
  • KJ4UTS
above and below 12 would be all of them except 2.14 and 2.15 and 2.16 and 2.17
Hero
  • Hero
Not really.
KJ4UTS
  • KJ4UTS
@hero it doesn't look like none of them are the answer because 12 does not fall in between any of these numbers
Hero
  • Hero
Okay.

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