document.write( "Question 96022: Find the axis of symmetry.
\n" ); document.write( " y = x^2 + 7x + 4
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Algebra.Com's Answer #69914 by jim_thompson5910(35256)\"\" \"About 
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To find the axis of symmetry, use this formula:\r
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\n" ); document.write( "\n" ); document.write( "\"x=-b%2F%282a%29\"\r
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\n" ); document.write( "\n" ); document.write( "From the equation \"y=x%5E2%2B7x%2B4\" we can see that a=1 and b=7\r
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\n" ); document.write( "\n" ); document.write( "\"x=%28-7%29%2F%282%2A1%29\" Plug in b=7 and a=1\r
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\n" ); document.write( "\n" ); document.write( "\"x=%28-7%29%2F2\" Multiply 2 and 1 to get 2\r
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\n" ); document.write( "\n" ); document.write( "So the axis of symmetry is \"x=-7%2F2\" or \"x=-3.5\" (in decimal form)
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