document.write( "Question 972200: Absolute value of (x^2 +6)= 5x \n" ); document.write( "
Algebra.Com's Answer #594608 by Theo(13342)![]() ![]() You can put this solution on YOUR website! split this up into two pieces.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "if the expression within the absolute value sign is positive, then you get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x^2 + 6 = 5x\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "subtract 5x from both sides of that equation and you get: \n" ); document.write( "x^2 - 5x + 6 = 0 \n" ); document.write( "factor that quadratic equation to get: \n" ); document.write( "(x-3)(x-2) = 0 \n" ); document.write( "solve for x to get: \n" ); document.write( "x = 3 \n" ); document.write( "x = 2\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "if the expression within the absolute value sign is negative, then you get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x^2 + 6 = -5x \n" ); document.write( "add 5x to both sides of that equation to get: \n" ); document.write( "x^2 + 5x + 6 = 0 \n" ); document.write( "factor that quadratic equation to get: \n" ); document.write( "(x+3)*(x+2) = 0 \n" ); document.write( "solve for x to get: \n" ); document.write( "x = -3 \n" ); document.write( "x = -2\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "your possible solutions are:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 2 \n" ); document.write( "x = 3 \n" ); document.write( "x = -2 \n" ); document.write( "x = -3\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x cannot be equal to -2 or -3 because than the absolute value is negative which is impossible because the absolute value of an expression is always positive.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "so x has to be 2 or 3 or nothing at all.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "replace x with 2 and replace x with 3 and you will see that the original equation is true.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "abs(x^2+6) = abs(15) when x = 3 and 5x = 15 when x = 3 \n" ); document.write( "abs(x^2+6) = abs(10) when x = 2 and 5x = 10 when x = 2\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "original equations confirm that the solution is correct.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "here's a graph of the two equations.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "you can see that they intersect when x = 2 and when x = 3.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " ![]() \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |