Seudónimo Seudónimo
  • 01-09-2016
  • Mathematics
contestada

Solve this equation using an algebraic method: (x + 4)( x - 4) = 9.

Please use your own answer :)

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Аноним Аноним
  • 01-09-2016
[tex]\star \ (x + 4)( x - 4) = 9.[/tex] 

[tex] \star \ x^2-4^2=9 [/tex]  [tex]Expand \ the \ given \ equation [/tex] 

[tex]\star [/tex]  [tex] x^2-16=9 [/tex] 

[tex]\star [/tex]  [tex] x^2=9+16 [/tex]  [tex]Combine \ like \ terms [/tex] 

[tex]\star [/tex]  [tex] x^2=25 [/tex] 

[tex]\star [/tex]  [tex]x= \sqrt{25}= \sqrt{5} [/tex] 

[tex]\star [/tex] [tex]x=5[/tex]

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