anonymous
  • anonymous
use the quadratic formula to find any x-intercepts on the graph of the equation. y=x^2 - 8x -1 x=?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
set y =0, and solve the quadratic equation
anonymous
  • anonymous
\[x ^{2}-8x-1=0\]
ZeHanz
  • ZeHanz
Set a=1, b=-8 and c=-1 in the QF.

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anonymous
  • anonymous
\[x=4+\sqrt{17} or x=4-\sqrt{17}\]
anonymous
  • anonymous
yup exactly
anonymous
  • anonymous
you need to use the quadratic formula
anonymous
  • anonymous
\[x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
anonymous
  • anonymous
so the final answer would be
anonymous
  • anonymous
\[(4+\sqrt{17}, 0) and (4-\sqrt{17}, 0)\]
anonymous
  • anonymous
8 square root 68 over 8?
anonymous
  • anonymous
yup
anonymous
  • anonymous
is it over 4?
anonymous
  • anonymous
if a =1 yes
anonymous
  • anonymous
so am i right? it is over 4
anonymous
  • anonymous
over 2x1

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