anonymous
  • anonymous
What is the vertex of the function f(x) = 7x2 - 28x - 60? (2, -88) (3, 56) (2, 88) (3, -56) confuse...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Mehek14
  • Mehek14
use \(\dfrac{-b}{2a}\)
anonymous
  • anonymous
-28 b?
anonymous
  • anonymous
and 7 a?

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Mehek14
  • Mehek14
\(\dfrac{-(-28)}{2*7}\)
Mehek14
  • Mehek14
\(\dfrac{28}{14}=2\)
anonymous
  • anonymous
28/14=2
Mehek14
  • Mehek14
the plug 2 into the equation for x
anonymous
  • anonymous
oh u did it before i could lol
anonymous
  • anonymous
2 is x?
Mehek14
  • Mehek14
\(f(2)=7*2^2 - 28*2 - 60\)
Mehek14
  • Mehek14
yes x=2
anonymous
  • anonymous
-88?
Mehek14
  • Mehek14
correct
anonymous
  • anonymous
2,-88
Mehek14
  • Mehek14
yup
anonymous
  • anonymous
good to see u back on too lol
Mehek14
  • Mehek14
:)
anonymous
  • anonymous
oh no, i dnt get the next one at all...post here or new post?
Mehek14
  • Mehek14
new?
anonymous
  • anonymous
wait i might be able to do it, let me post it and show my work before u comment to check it?
Mehek14
  • Mehek14
ok

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