document.write( "Question 210931: Two cars leave an intersection. One car travels north; the other travels east. When the car traveling north had gone 24 miles, the distance between the cars was four miles more than three times the distance traveled by the car heading east. Find the distance between the cars at that time \n" ); document.write( "
Algebra.Com's Answer #159364 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"e\"= distance travelled by the
\n" ); document.write( "car going east when the car going north
\n" ); document.write( "has gone \"24\" mi
\n" ); document.write( "given:
\n" ); document.write( "Distance between the cars is
\n" ); document.write( "\"3e+%2B+4\"
\n" ); document.write( "Using the pythagorean theorem, I can say
\n" ); document.write( "\"24%5E2+%2B+e%5E2+=+%283e+%2B+4%29%5E2\"
\n" ); document.write( "\"576+%2B+e%5E2+=+9e%5E2+%2B+24e+%2B+16\"
\n" ); document.write( "\"8e%5E2+%2B+24e+-+560+=+0\"
\n" ); document.write( "\"e%5E2+%2B+3e+-+70+=+0\"
\n" ); document.write( "Using the quadratic formula:
\n" ); document.write( "\"e+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"a+=+1\"
\n" ); document.write( "\"b+=+3\"
\n" ); document.write( "\"c+=+-70\"
\n" ); document.write( "\"e+=+%28-3+%2B-+sqrt%28+3%5E2-4%2A1%2A%28-70%29+%29%29%2F%282%2A1%29+\"
\n" ); document.write( "\"e+=+%28-3+%2B-+sqrt%28+9+%2B+280+%29%29%2F2+\"
\n" ); document.write( "\"e+=+%28-3+%2B-+sqrt%28+289+%29%29%2F2+\"
\n" ); document.write( "\"e+=+%28-3+%2B-+17%29%2F2+\"
\n" ); document.write( "\"e+=+%28-3+-+17%29%2F2\" (Can't use this answer)
\n" ); document.write( "\"e+=+%28-3+%2B+17%29%2F2\"
\n" ); document.write( "\"e+=+14%2F2\"
\n" ); document.write( "\"e+=+7\"
\n" ); document.write( "and, since distance between the cars is
\n" ); document.write( "\"3e+%2B+4\"
\n" ); document.write( "\"3%2A7+%2B+4+=+25\" mi
\n" ); document.write( "The distance between the cars is 25 mi
\n" ); document.write( "check:
\n" ); document.write( "\"24%5E2+%2B+7%5E2+=+25%5E2\"
\n" ); document.write( "\"576+%2B+49+=+625\"
\n" ); document.write( "\"625+=+625\"
\n" ); document.write( "OK\r
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