document.write( "Question 946597: (4t-5)^2-10(4t-5)+21=0 \n" ); document.write( "

Algebra.Com's Answer #577478 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use a substitution,
\n" ); document.write( " $\"u=4t-5\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"u%5E2-10u%2B21=0\"$
\n" ); document.write( " $\"%28u-7%29%28u-3%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"u-7=0\"$
\n" ); document.write( " $\"u=7\"$
\n" ); document.write( " $\"4t-5=7\"$
\n" ); document.write( " $\"4t=12\"$
\n" ); document.write( " $\"t=3\"$
\n" ); document.write( "and
\n" ); document.write( " $\"u-3=0\"$
\n" ); document.write( " $\"u=3\"$
\n" ); document.write( " $\"4t-5=3\"$
\n" ); document.write( " $\"4t=8\"$
\n" ); document.write( " $\"t=2\"$
\n" ); document.write( " \n" ); document.write( "

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