document.write( "Question 363260: The diagram shows an isosceles right triangle.
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document.write( "The two legs are \"x,\" and the hypotenuse is x radical 2.
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document.write( "A. If its perimeter is 10, find x.
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document.write( "B. If its area is 12, find x. \n" );
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Algebra.Com's Answer #259241 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! The diagram shows an isosceles right triangle. \n" ); document.write( "The two legs are \"x,\" and the hypotenuse is x radical 2. \n" ); document.write( ": \n" ); document.write( "A. If its perimeter is 10, find x. \n" ); document.write( "x + x + \n" ); document.write( "2x + \n" ); document.write( " \n" ); document.write( "Square both sides \n" ); document.write( "x^2(2) = (-2x+10)^2 \n" ); document.write( "FOIL (-2x+10)*(-2x+10) \n" ); document.write( "2x^2 = 4x^2 - 20x - 20x + 100 \n" ); document.write( "2x^2 = 4x^2 - 40x + 100 \n" ); document.write( ": \n" ); document.write( "Combine on the right \n" ); document.write( "0 = 4x^2 - 2x^2 - 40x + 100 \n" ); document.write( ": \n" ); document.write( "A quadratic equation \n" ); document.write( "2x^2 - 40x + 100 = 0 \n" ); document.write( ": \n" ); document.write( "Simplify, divide by 2 \n" ); document.write( "x^2 - 20x + 50 = 0 \n" ); document.write( "Use the quadratic formula to find x, a=1; b=-20; c=50 \n" ); document.write( "Two solutions \n" ); document.write( "x = 17.06 \n" ); document.write( "and \n" ); document.write( "x = 2.93 is the only reasonable solution \n" ); document.write( "Check \n" ); document.write( "2(2.93) + \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "B. If its area is 12, find x. \n" ); document.write( ".5(x*x) = 12 \n" ); document.write( "multiply both sides by 2 \n" ); document.write( "x^2 = 24 \n" ); document.write( "x = \n" ); document.write( "x = 4.9 \n" ); document.write( ": \n" ); document.write( "Check \n" ); document.write( ".5 * 4.9 * 4.9 = 12.0 \n" ); document.write( " |