document.write( "Question 983829: Solve cx^2-ax=b by completing the square. \n" ); document.write( "

Algebra.Com's Answer #604623 by Timnewman(323) $\"\"$ $\"About$

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Hi dear!
\n" ); document.write( "To solve $\"x%5E%282%29%2B2.5x=1.6\"$ using completing the square method,take half of 2.5(i.e $\"%281%2F2%29%282.5%29\"$ ) square it,and add the result to both sides of the equation.
\n" ); document.write( "Here is the working;
\n" ); document.write( " $\"x%5E%282%29%2B2.5x=1.6\"$
\n" ); document.write( " $\"x%5E2%2B2.5x%2B%282.5%2F2%29%5E%282%29=1.6%2B%282.5%2F2%29%5E%282%29\"$
\n" ); document.write( " $\"%28x%2B%282.5%2F2%29%29%5E%282%29=1.6%2B%286.25%2F4\"$
\n" ); document.write( " $\"%28x%2B%282.5%2F2%29%29%5E%282%29=6.4%2B6.25\"$
\n" ); document.write( " $\"x%2B%282.5%2F2%29=sqrt%2812.65%29\"$
\n" ); document.write( " $\"x=%2B-3.6-%282.5%2F2%29\"$
\n" ); document.write( "x= 3.6-1.25 or -3.6-1.25
\n" ); document.write( "x=2.35 or -4.85 \n" ); document.write( "

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