document.write( "Question 968878: What is the domain and range of the function f(x)=-2x-7. And how do you get those answers? \n" ); document.write( "
Algebra.Com's Answer #591990 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "When finding the domain you ask the question:\r\n" );
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document.write( "Are there any numbers that cannot be substituted for x?\r\n" );
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document.write( "If the answer is \"no\", then the DOMAIN is \"%28matrix%281%2C3%2C-infinity%2C%22%2C%22%2Cinfinity%29%29\"\r\n" );
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document.write( "If the answer is \"yes\", then exclude any such numbers from the DOMAIN.\r\n" );
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document.write( "When finding the range, replace f(x) by y.  Solve for x.\r\n" );
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document.write( "Ask the question:\r\n" );
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document.write( "Are there any numbers that cannot be substituted for y?\r\n" );
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document.write( "If the answer is \"no\", then the RANGE is \"%28matrix%281%2C3%2C-infinity%2C%22%2C%22%2Cinfinity%29%29\"\r\n" );
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document.write( "If the answer is \"yes\", then exclude any such numbers from the RANGE.\r\n" );
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document.write( "In your problem, ask the question:\r\n" );
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document.write( "Are there any numbers that cannot be substituted for x in f(x)=-2x-7?\r\n" );
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document.write( "The answer is \"no\" because there are no denominators to become 0,\r\n" );
document.write( "and there are no square roots to have negative numbers under them.\r\n" );
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document.write( "So the domain is \"%28matrix%281%2C3%2C-infinity%2C%22%2C%22%2Cinfinity%29%29\"\r\n" );
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document.write( "Replace f(x) by y\r\n" );
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document.write( "y = -2x-7\r\n" );
document.write( " Solve for x\r\n" );
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document.write( "2x = -y-7\r\n" );
document.write( " x = \"%28-y-7%29%2F2\"\r\n" );
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document.write( "Ask the question:\r\n" );
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document.write( "Are there any numbers that cannot be substituted for y?\r\n" );
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document.write( "The answer is \"no\" because there are no denominators to become 0, since\r\n" );
document.write( "the only denominator is the constant 2.  There are no square roots to have\r\n" );
document.write( "negative numbers under them.\r\n" );
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document.write( "So the RANGE is \"%28matrix%281%2C3%2C-infinity%2C%22%2C%22%2Cinfinity%29%29\"\r\n" );
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document.write( "Edwin

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