document.write( "Question 84550: what rational numbers are roots of the equation (X2-7)(X2-9)=0 \n" ); document.write( "

Algebra.Com's Answer #60927 by funmath(2933) $\"\"$ $\"About$

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what rational numbers are roots of the equation (X2-7)(X2-9)=0
\n" ); document.write( " $\"%28x%5E2-7%29%28x%5E2-9%29=0\"$
\n" ); document.write( " $\"x%5E2-7=0\"$ or $\"x%5E2-9=0\"$
\n" ); document.write( " $\"x%5E2-7%2B7=0%2B7\"$ or $\"x%5E2-9%2B9=0%2B9\"$
\n" ); document.write( " $\"x%5E2=7\"$ or $\"x%5E2=9\"$
\n" ); document.write( " $\"sqrt%28x%5E2%29=%2B-sqrt%287%29\"$ or $\"sqrt%28x%5E2%29=%2B-sqrt%289%29\"$
\n" ); document.write( " $\"x=%2B-sqrt%287%29\"$ or x=+/-3
\n" ); document.write( " $\"%2B-sqrt%287%29\"$ are irrational, but +/- 3 are rational, so your answers are:
\n" ); document.write( " $\"highlight%28x=-3%29\"$ or $\"highlight%28x=3%29\"$
\n" ); document.write( "Happy Calculating!!! \n" ); document.write( "

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