document.write( "Question 656246: My text book is the Blitzer College Algebra book and the text asks to \"Solve each equation by making an appropriate substitution\" and the problem I need help with is...\r
\n" ); document.write( "\n" ); document.write( "9x^4=25x^2-16 \n" ); document.write( "

Algebra.Com's Answer #409412 by Tatiana_Stebko(1539) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"u=x%5E2\"$
\n" ); document.write( " $\"9u%5E2=25u-16\"$
\n" ); document.write( " $\"9u%5E2-25u%2B16=0\"$
\n" ); document.write( " $\"%289u-16%29%28u-1%29=0\"$
\n" ); document.write( " $\"9u-16=0\"$ or $\"u-1=0\"$
\n" ); document.write( " $\"u=16%2F9\"$ or $\"u=1\"$
\n" ); document.write( " $\"x%5E2=16%2F9\"$ or $\"x%5E2=1\"$
\n" ); document.write( " $\"x=4%2F3\"$ , $\"x=-4%2F3\"$ , $\"x=1\"$ , $\"x=-1\"$ \n" ); document.write( "

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