document.write( "Question 972200: Absolute value of (x^2 +6)= 5x \n" ); document.write( "
Algebra.Com's Answer #594608 by Theo(13342)\"\" \"About 
You can put this solution on YOUR website!
split this up into two pieces.\r
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\n" ); document.write( "\n" ); document.write( "if the expression within the absolute value sign is positive, then you get:\r
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\n" ); document.write( "\n" ); document.write( "x^2 + 6 = 5x\r
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\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
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\n" ); document.write( "\n" ); document.write( "if the expression within the absolute value sign is negative, then you get:\r
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\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
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\n" ); document.write( "\n" ); document.write( "your possible solutions are:\r
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\n" ); document.write( "\n" ); document.write( "x = 2
\n" ); document.write( "x = 3
\n" ); document.write( "x = -2
\n" ); document.write( "x = -3\r
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\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
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\n" ); document.write( "\n" ); document.write( "so x has to be 2 or 3 or nothing at all.\r
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\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
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\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
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\n" ); document.write( "\n" ); document.write( "original equations confirm that the solution is correct.\r
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\n" ); document.write( "\n" ); document.write( "here's a graph of the two equations.\r
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\n" ); document.write( "\n" ); document.write( "you can see that they intersect when x = 2 and when x = 3.\r
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