document.write( "Question 1187763: Given that f(x)=x^3+ax^2+bx-3 leaves remainders 1 and -9 when divided by x-1 and x+1. Calculate the values of a and b
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Algebra.Com's Answer #818774 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "use long division\r
\n" ); document.write( "\n" ); document.write( "......(\"x%5E2%2B%28a+%2B1%29x%2B%28b%2Ba+%2B1%29\"
\n" ); document.write( " \"x-1\"| \"x%5E3%2Bax%5E2%2Bbx-3\"
\n" ); document.write( "........\"x%5E3-x%5E2\"
\n" ); document.write( "..............\"ax%5E2%2Bx%5E2\"
\n" ); document.write( "..............\"%28a+%2B1%29x%5E2%2Bbx\"
\n" ); document.write( "..............\"%28a+%2B1%29x%5E2-%28a+%2B1%29x+\"
\n" ); document.write( "..............................\"bx%2B%28a+%2B1%29x+-3\"
\n" ); document.write( "................................\"%28b%2Ba+%2B1%29x+-%28b%2Ba+%2B1%29\"
\n" ); document.write( "........................................... \"-3%2Bb%2Ba+%2B1\"
\n" ); document.write( "........................................... \"+b%2Ba+-2+\"=> reminder\"+b%2Ba+-2+=1\"=>\"b%2Ba+=3\"..........eq.1\r
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\n" ); document.write( "\n" ); document.write( "......(\"x%5E2%2B%281+-a%29x%2B%28b%2B1+-a%29\"
\n" ); document.write( " \"x%2B1\"| \"x%5E3%2Bax%5E2%2Bbx-3\"
\n" ); document.write( "........\"x%5E3%2Bx%5E2\"
\n" ); document.write( "..............\"ax%5E2-x%5E2\"
\n" ); document.write( "...............\"%281+-a%29x%5E2%2Bbx\"
\n" ); document.write( "...............\"%281+-a%29x%5E2-%281+-a%29x+-3\"
\n" ); document.write( "..........................\"bx%2B%281+-a%29x+%2B%28b%2B1+-a%29\"
\n" ); document.write( "................................................\"-3-%28b%2B1+-a%29+\"
\n" ); document.write( "................................................. \"-3-b-1%2Ba++\"
\n" ); document.write( "................................................ \"+a-b+-4\" => reminder \"+a-b+-4+=-9\"=> \"a-b+=-5\"..........eq.2\r
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\n" ); document.write( "\n" ); document.write( "go to\r
\n" ); document.write( "\n" ); document.write( "\"b%2Ba+=3\"..........eq.1, solve for \"a\"
\n" ); document.write( "\"a=3-b\"\r
\n" ); document.write( "\n" ); document.write( "go to\r
\n" ); document.write( "\n" ); document.write( "\"a-b+=-5\"..........eq.2, substitute \"a\"
\n" ); document.write( "\"3-b-b+=-5\"
\n" ); document.write( "\"3-2b+=-5\"
\n" ); document.write( "\"3%2B5+=2b\"
\n" ); document.write( "\"2b=8\"
\n" ); document.write( "\"b=4\"\r
\n" ); document.write( "\n" ); document.write( "then\r
\n" ); document.write( "\n" ); document.write( "\"a=3-b\" => \"a=3-4\" => \"a=-1\"\r
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\n" ); document.write( "\n" ); document.write( "your equation is\r
\n" ); document.write( "\n" ); document.write( "\"f%28x%29=x%5E3-1x%5E2%2B4x-3\"\r
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\n" ); document.write( "\n" ); document.write( "check reminders:\r
\n" ); document.write( "\n" ); document.write( "\"x%5E3+-+x%5E2+%2B+4+x+-+3+=+%28x%5E2+%2B+4%29%2A%28x+-+1%29+%2B+1\"
\n" ); document.write( "\"x%5E3+-+x%5E2+%2B+4+x+-+3+=+%28x%5E2+-+2+x+%2B+6%29%2A%28x+%2B+1%29+%2B+%28-9%29\"\r
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