document.write( "Question 277147: 1) x squared - 4x + 5 = 0\r
\n" ); document.write( "\n" ); document.write( "2) C squared + 6c + 8 = 0\r
\n" ); document.write( "\n" ); document.write( "3) a squared - 2a = -1\r
\n" ); document.write( "\n" ); document.write( "4) n squared - 7n = -10 \n" ); document.write( "
Algebra.Com's Answer #201816 by CharlesG2(834)\"\" \"About 
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1) x squared - 4x + 5 = 0\r
\n" ); document.write( "\n" ); document.write( "x^2 - 4x + 5 = 0
\n" ); document.write( "use ax^2 + bx + c = 0
\n" ); document.write( "a = 1, b = -4, c = 5
\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"x+=+%284+%2B-+sqrt%28+16+-+4%2A5+%29%29%2F2+\"
\n" ); document.write( "\"x+=+%284+%2B-+sqrt%28+16+-+20+%29%29%2F2+\"
\n" ); document.write( "\"x+=+%284+%2B-+sqrt%28+-4+%29%29%2F2+\"
\n" ); document.write( "\"x+=+%284+%2B-+2i%29%2F2+\"
\n" ); document.write( "\"x+=+2+%2B-+i+\"
\n" ); document.write( "check: (2+i)^2 - 4(2+i) + 5 = 0
\n" ); document.write( " 4 + 4i - 1 - 8 - 4i + 5 = 0
\n" ); document.write( " 4 - 1 - 8 + 5 + 4i - 4i = 0
\n" ); document.write( " 3 - 8 + 5 = 0
\n" ); document.write( " - 5 + 5 = 0
\n" ); document.write( " 0 = 0
\n" ); document.write( " (2-i)^2 - 4(2-i) + 5 = 0
\n" ); document.write( " 4 - 4i - 1 - 8 + 4i + 5 = 0
\n" ); document.write( " 4 - 1 - 8 + 5 = 0
\n" ); document.write( " 3 - 8 + 5 = 0
\n" ); document.write( " - 5 + 5 = 0
\n" ); document.write( " 0 = 0\r
\n" ); document.write( "\n" ); document.write( "2) C squared + 6c + 8 = 0 \r
\n" ); document.write( "\n" ); document.write( "c^2 + 6c + 8 = 0
\n" ); document.write( "(c+2)(c+4) = 0 (using foil this does come out to the above)
\n" ); document.write( "c = -2 or c = -4\r
\n" ); document.write( "\n" ); document.write( "3) a squared - 2a = -1 \r
\n" ); document.write( "\n" ); document.write( "a^2 - 2a = -1
\n" ); document.write( "a^2 -2a + 1 = 0
\n" ); document.write( "(a-1)(a-1) = 0
\n" ); document.write( "one answer a=1\r
\n" ); document.write( "\n" ); document.write( "4) n squared - 7n = -10\r
\n" ); document.write( "\n" ); document.write( "n^2 - 7n = -10
\n" ); document.write( "n^2 - 7n + 10 = 0
\n" ); document.write( "(n - 2)(n - 5) = 0
\n" ); document.write( "n = 2 or n = 5
\n" ); document.write( " \n" ); document.write( "
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