#functions I need help

41 messages · Page 1 of 1 (latest)

gilded vine
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A function g(x) = -2x² + p, where p is an integer. Given that g(p)=28

A. Find the value of p,

B. Hence evaluate g(3)

pine escarpBOT
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  1. Wait patiently for a helper to come along.
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unborn pelican
gilded vine
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Sorry -28

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Not 28 wrong question

unborn pelican
gilded vine
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I'm quite bad at math so how do I exactly... Solve for p?

hasty peak
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quadratic equation

gilded vine
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Ohhh

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Alright got it

unborn pelican
hasty peak
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or use the quadratic formula

unborn pelican
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yes

gilded vine
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So for g(3) would it be

2(3)² + 3?

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2(3)² + 3*

hasty peak
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no

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did you obtain the value of p?

gilded vine
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Yep

hasty peak
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what is it

gilded vine
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-7/2 , 4

hasty peak
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right so

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we know

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that p is an integer

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from the question

gilded vine
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But for g(3) do we use the previous equation?

hasty peak
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meaning that we throw away -7/2

gilded vine
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Mhmm

hasty peak
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and have p = 4

gilded vine
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Alright

hasty peak
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and then we remember that

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g(x) = -2x^2 + p

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so we plug in our value of p, that is 4

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and we obtain

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g(x) = -2x^2 + 4

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and now all thats left to do is finding the value of g(3)

gilded vine
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Ohh yeagh

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The answer would be -14 if I'm correct?

hasty peak
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yes

gilded vine
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Tq so much

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+close