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ieshapettis ieshapettis
  • 08-05-2014
  • Mathematics
Answered

Solve x2-14x+21=0 by completing the square

Verified Answer :

Anonymous Anonymous
  • 26-07-2014

\(x^2-14x+21=0\\\\x^2-2x\cdot7+7^2-7^2+21=0\\\\(x-7)^2-49+21=0\\\\(x-7)^2-28=0\\\\(x-7)^2=28\iff x-7=-\sqrt{28}\ \vee\ x-7=\sqrt{28}\\\\x=7-\sqrt{4\cdot7}\ \vee\ x=7+\sqrt{4\cdot7}\\\\x=7-2\sqrt7\ \vee\ x=7+2\sqrt7\)

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