document.write( "Question 881375: Find all values of x for which f(x)=o when f is defined by f(x)=x^2-4x-1. \n" ); document.write( "

Algebra.Com's Answer #532205 by josgarithmetic(39620) $\"\"$ $\"About$

You can put this solution on YOUR website!
What? o or 0 ?\r
\n" ); document.write( "\n" ); document.write( "If you mean this, $\"x%5E2-4x-1=0\"$ then you can use general solution to a quadratic formula:\r
\n" ); document.write( "\n" ); document.write( " $\"x=%284%2B-+sqrt%28%28-4%29%5E2-4%2A1%2A%28-1%29%29%29%2F2\"$
\n" ); document.write( " $\"x=%284%2B-+sqrt%2820%29%29%2F2\"$
\n" ); document.write( " $\"x=%284%2B-+2sqrt%285%29%29%2F2\"$
\n" ); document.write( " $\"highlight%28x=2%2B-+sqrt%285%29%29%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "If you did mean $\"o=x%5E2-4x-1\"$ , this can be dealt similarly after adding $\"-o\"$ to both sides. \n" ); document.write( "

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