anonymous
  • anonymous
x2 - 4 = 0 x = 2; x = -2 x = 2 no solutions x = -2
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Factor the left side of the equation as (x+2)(x-2). If (x+2)(x-2)=0, then one or both of the factors must be equal 0. Therefore, x must be -2 or 2.
anonymous
  • anonymous
Lisa has three hog panels. Panel A is 8 feet long, panel B is 3 feet long, and panel C is 7 feet long. If the full length of each panel is used, can she build a triangular pen to hold her pet pig? No, 8 - 7 < 3 Yes, 3 + 7 > 8 No, 3 + 7 < 8 Yes, 8 - 3 > 7
anonymous
  • anonymous
Why bother factoring? That is equivalent with \[x^2=4\]which immediately and apparently has solutions of \[x _{1,2}=\pm2\]

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