document.write( "Question 438741: I have a question
\n" ); document.write( "Simplify by factoring. $\"sqrt%2848a%5E2b%29\"$ \r
\n" ); document.write( "\n" ); document.write( "Simplify $\"3+sqrt%28-1%2F125%29\"$ \r
\n" ); document.write( "\n" ); document.write( "Solve $\"sqrt%285x%2B21%29=x%2B3\"$ \n" ); document.write( "

Algebra.Com's Answer #303310 by unlockmath(1688) $\"\"$ $\"About$

You can put this solution on YOUR website!
Hello,
\n" ); document.write( "I'll help you with the last one.
\n" ); document.write( "sqrt(5x+21)=x+3
\n" ); document.write( "First off we can square both sides to
\n" ); document.write( "5x+21=(x+3)^2
\n" ); document.write( "Expand this out:
\n" ); document.write( "5x+21=x^2+6x+9
\n" ); document.write( "Subtract 5x and 21 to get:
\n" ); document.write( "x^2+x-12=0
\n" ); document.write( "Factor
\n" ); document.write( "(x-3)(x+4)=0
\n" ); document.write( "Solve for x
\n" ); document.write( "x=3
\n" ); document.write( "x=-4
\n" ); document.write( "So we find that 3 works in the equation.
\n" ); document.write( "Make sense?
\n" ); document.write( "RJ
\n" ); document.write( "www.math-unlock.com \n" ); document.write( "

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