document.write( "Question 1059284: I need to make up a rational function that has the following characteristics : crosses the x-axis at 3; touches the x-axis at -2;, has a vertical asymptote at x=1 and at x=-4; has a hole at x=5; and has a horizontal asymptote at y=2 \n" ); document.write( "
Algebra.Com's Answer #674351 by josgarithmetic(39623)\"\" \"About 
You can put this solution on YOUR website!
NOTE: Because of the \"touch at x=-2\" part of the description, another tutor may need to discuss this exercise for a better solution.\r
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\n" ); document.write( "\n" ); document.write( "Only some GUIDANCE...\r
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\n" ); document.write( "\n" ); document.write( "The numerator may control all your x-intercepts. Having a horizontal asymtptote means degree of numerator and degree of denominator are the same. Your vertical asymptotes tell you where along the x-axis the \"roots\" for the numerator are.\r
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\n" ); document.write( "\n" ); document.write( "That should help you very much.\r
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\n" ); document.write( "\n" ); document.write( "--According to your personal note, the guidance above was not clear enough for you or you did not seem ready for that guidance.\r
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\n" ); document.write( "\n" ); document.write( "Look at the specifications for your rational function:
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\n" ); document.write( "Zeros at x for 3 and -2
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\n" ); document.write( "Hole at x=5
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\n" ); document.write( "\n" ); document.write( "Two things may stand out to you right-away.
\n" ); document.write( "Horizontal Asymptote, telling you degree of numerator and denominator are same; and the hole and the vertical asymptotes tell you three x-values for which the function is undefined.\r
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\n" ); document.write( "\n" ); document.write( "Give the function a factor, k.\r
\n" ); document.write( "\n" ); document.write( "\"y=k%28x-a%29%28x-b%29%28x-5%29%2F%28%28x-1%29%28x-%28-4%29%29%28x-5%29%29\"
\n" ); document.write( "Look and see that:
\n" ); document.write( "(*) Degree of numerator and denominator are equal.
\n" ); document.write( "(*) \"x-5\" is a factor in both the numerator AND the denominator.\r
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\n" ); document.write( "\n" ); document.write( "Good so far?\r
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\n" ); document.write( "\n" ); document.write( "Degree of numerator is 3 and degree of denominator is ALSO 3.
\n" ); document.write( "Formula for y contains the factor \"%28x-5%29%2F%28x-5%29\", obviously an expression meaning \"1\", but makes the formula undefined at x=5.\r
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\n" ); document.write( "\n" ); document.write( "A minor simplification of the formula:\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28k%28x-3%29%28x%2B2%29%28x-5%29%29%2F%28%28x-1%29%28x%2B4%29%28x-5%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "Notice this also written to account for the two zeros at x=3 and x=-2.\r
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\n" ); document.write( "\n" ); document.write( "The horizontal asymptote:
\n" ); document.write( "Need y=2 when x goes unbound toward either negative or positive infinity.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%282%28x-3%29%28x%2B2%29%28x-5%29%29%2F%28%28x-1%29%28x%2B4%29%28x-5%29%29\"
\n" ); document.write( "Note that this solution attempt may still be incomplete, because I am unsure how to establish that y crosses x-axis at 3 but TOUCHES the x-axis at -2. Another tutor may need to help with finishing for that.\r
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