anonymous
  • anonymous
4x²-4 = 4 Solve quadratic function with square roots
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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xapproachesinfinity
  • xapproachesinfinity
Hint add 4 to both sides
anonymous
  • anonymous
Then I get 4x²=8 Do I divide by 4 now?
xapproachesinfinity
  • xapproachesinfinity
Exactly!

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anonymous
  • anonymous
So then x²=2 How do I square root that? Or is there no way
xapproachesinfinity
  • xapproachesinfinity
apply square root to both sides
xapproachesinfinity
  • xapproachesinfinity
\[\sqrt{x^2}=\sqrt{2}\]
anonymous
  • anonymous
And having a decimal as an answer is fine?
xapproachesinfinity
  • xapproachesinfinity
no leave it like that so what are the answers? they two answers
xapproachesinfinity
  • xapproachesinfinity
there are two answers
anonymous
  • anonymous
x=-2 x=2 ?
xapproachesinfinity
  • xapproachesinfinity
not quite they are \[x=\sqrt{2} , ~ x=-\sqrt{2}\]
xapproachesinfinity
  • xapproachesinfinity
i don't why you destroyed that square root you needed to simplify the left side \[\sqrt{x^2}\]

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