document.write( "Question 964106: Lauren is 4 years older than David. The product of their ages is 45. How old is Lauren?
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Algebra.Com's Answer #588992 by macston(5194) $\"\"$ $\"About$

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\n" ); document.write( "L=Lauren's age; D=David's age=L-4
\n" ); document.write( " $\"LD=45\"$ Substitute for D
\n" ); document.write( " $\"L%28L-4%29=45\"$
\n" ); document.write( " $\"L%5E2-4L=45\"$ Subtract 45 from each side.
\n" ); document.write( " $\"L%5E2-4L-45=0\"$
\n" ); document.write( " $\"%28L-9%29%28L%2B5%29=0\"$
\n" ); document.write( " $\"L-9=0\"$ $\"or\"$ $\"L%2B5=0\"$
\n" ); document.write( " $\"L=9\"$ $\"or\"$ $\"L=-5\"$
\n" ); document.write( "ANSWER: Lauren is 9 years old.
\n" ); document.write( "CHECK:
\n" ); document.write( "D=L-4=9-4=5 David is 5 years old.
\n" ); document.write( "L*D=45
\n" ); document.write( "9*5=45
\n" ); document.write( "45=45 \n" ); document.write( "

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