document.write( "Question 1087984: Hi there,really stumped by this question. For a circle with the equation x^2 + y^2 - 2x - 14y + 25 = 0, show that if the line y = mx + c intersects the circle at two points, then (1 + 7m)^2 - 25(1 + m^2) > 0.
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document.write( "I can work out the centre of the circle to be (1,7) and the radius as 5, but I cannot see that helps.
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document.write( "Paul \n" );
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Algebra.Com's Answer #702258 by ikleyn(52817)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( "The idea on how to solve this problem is THIS:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "1. Substitute y = mx +c into the second degree equation, replacing y. You will get\r\n" ); document.write( "\r\n" ); document.write( "\r \n" ); document.write( "\n" ); document.write( "I completed my tutor's instructions.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "You implement this guiding idea.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |