anonymous
  • anonymous
Find the max/min values for P(x) = -2x^2 +8x-1
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
on a graphing calculator it reads that 7 is the local maximum (y=7)
RadEn
  • RadEn
*The first way, find the x-vertec by use formula x=-b/2a = -8/2(-2) = 2 to find the max value, just plug x=2 to P(x) so, P(2) = -2(2)^2+8(2)-1=7 *The 2nd way, use the formula y=-D/4a (with D=b^2-4ac) y_max = -(8^2-4(-2)(-1))/4(-2) = -(64-8)/-8 = -56/-8 = 7
ash2326
  • ash2326
@oheneba do you know calculus?

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anonymous
  • anonymous
To an extent
zzr0ck3r
  • zzr0ck3r
you dont even need calculus, just use the vertex formula you learn in algebra. you know it is a parabola that opens down, so you will have a max value. it will be the y component of the vertex
anonymous
  • anonymous
Thanks

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