anonymous
  • anonymous
Can someone please help me find b and c so that the parabola y=-3x^2+bx+c has vertex . (8,4)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Mertsj
  • Mertsj
Use vertex form and put in the vertex. a = -3
Hero
  • Hero
use x = -b/2a
Mertsj
  • Mertsj
\[y=-3(x-8)^{2}+4\]

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Mertsj
  • Mertsj
Now rearrange the right side.
anonymous
  • anonymous
so do i just solve for y
Mertsj
  • Mertsj
\[y=-3(x ^{2}-16x+64)+4=-3x ^{2}-48x-188\]
Mertsj
  • Mertsj
\[y=-3x ^{2}-48x-188\]
anonymous
  • anonymous
OK, yea it worked for c=-188 but i put in b=-48 and it said inccorect, i was doing it the way you suggested but i cant seem to figure out what b is
Mertsj
  • Mertsj
Oh gee. -3 (-16x)= POSITIVE 48x Sorry.
anonymous
  • anonymous
yea i just got it, thanks so much
Mertsj
  • Mertsj
yw
anonymous
  • anonymous
theres also another problem, i think you were actually helping me out with it last week just wondering if you had time to help me again with it cant seem to figure it out

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