document.write( "Question 297081: 4x2+20x+25=-2 \n" ); document.write( "
Algebra.Com's Answer #213963 by jim_thompson5910(35256)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"4x%5E2%2B20x%2B25=-2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"4x%5E2%2B20x%2B25%2B2=0\" Add 2 to both sides.\r
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\n" ); document.write( "\n" ); document.write( "\"4x%5E2%2B20x%2B27=0\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "Notice that the quadratic \"4x%5E2%2B20x%2B27\" is in the form of \"Ax%5E2%2BBx%2BC\" where \"A=4\", \"B=20\", and \"C=27\"\r
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\n" ); document.write( "\n" ); document.write( "Let's use the quadratic formula to solve for \"x\":\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-B+%2B-+sqrt%28+B%5E2-4AC+%29%29%2F%282A%29\" Start with the quadratic formula\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-%2820%29+%2B-+sqrt%28+%2820%29%5E2-4%284%29%2827%29+%29%29%2F%282%284%29%29\" Plug in \"A=4\", \"B=20\", and \"C=27\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20+%2B-+sqrt%28+400-4%284%29%2827%29+%29%29%2F%282%284%29%29\" Square \"20\" to get \"400\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20+%2B-+sqrt%28+400-432+%29%29%2F%282%284%29%29\" Multiply \"4%284%29%2827%29\" to get \"432\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20+%2B-+sqrt%28+-32+%29%29%2F%282%284%29%29\" Subtract \"432\" from \"400\" to get \"-32\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20+%2B-+sqrt%28+-32+%29%29%2F%288%29\" Multiply \"2\" and \"4\" to get \"8\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20+%2B-+4i%2Asqrt%282%29%29%2F%288%29\" Simplify the square root (note: If you need help with simplifying square roots, check out this solver) \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-20%2B4i%2Asqrt%282%29%29%2F%288%29\" or \"x+=+%28-20-4i%2Asqrt%282%29%29%2F%288%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5%2Bi%2Asqrt%282%29%29%2F%282%29\" or \"x+=+%28-5-i%2Asqrt%282%29%29%2F%282%29\" Reduce. \r
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\n" ); document.write( "\n" ); document.write( "So the solutions are \"x+=+%28-5%2Bi%2Asqrt%282%29%29%2F%282%29\" or \"x+=+%28-5-i%2Asqrt%282%29%29%2F%282%29\" \r
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