document.write( "Question 61750This question is from textbook college algebra
\n" ); document.write( ": Solve the following quadratic equations by using quadratic formula.\r
\n" ); document.write( "\n" ); document.write( "2.1y^2-3.5y=4\r
\n" ); document.write( "\n" ); document.write( "a(a+2)=-1\r
\n" ); document.write( "\n" ); document.write( "6x^2+5x-4=3x-2\r
\n" ); document.write( "\n" ); document.write( "4x^2-14x-27=3 \n" ); document.write( "
Algebra.Com's Answer #42796 by ankor@dixie-net.com(22740)\"\" \"About 
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Solve the following quadratic equations by using quadratic formula.
\n" ); document.write( "2.1y^2 - 3.5y = 4
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\n" ); document.write( "2.1y^2 - 3.5y - 4 = 0
\n" ); document.write( "I assume you know that the quadratic formula is, here is the first one step-by=step:
\n" ); document.write( " a = 2.1; b = -3.5; c = -4
\n" ); document.write( ":
\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"y+=+%28-%28-3.5%29+%2B-+sqrt%28+%28-3.5%5E2%29-4%2A2.1%2A-4+%29%29%2F%282%2A2.1%29+\"
\n" ); document.write( "\"y+=+%28%2B3.5+%2B-+sqrt%2812.25+-+%28-33.6%29++%29%29%2F%284.2%29+\"
\n" ); document.write( "\"y+=+%28%2B3.5+%2B-+sqrt%2812.25+%2B+33.6+%29%29%2F%284.2%29+\"
\n" ); document.write( "\"y+=+%28%2B3.5+%2B-+sqrt%2845.85+%29%29%2F%284.2%29+\"
\n" ); document.write( "\"y+=+%28%2B3.5+%2B+6.77%29%2F%284.2%29+\"
\n" ); document.write( "\"y+=+10.27%2F4.2+\"
\n" ); document.write( "y = +2.446
\n" ); document.write( "and
\n" ); document.write( "\"y+=+%28%2B3.5+-+6.77%29%2F%284.2%29+\"
\n" ); document.write( "\"y+=+-3.27%2F4.2+\"
\n" ); document.write( "y = -.779
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\n" ); document.write( "a(a+2) = -1
\n" ); document.write( "a^2 + 2a + 1 = 0;
\n" ); document.write( "a = 1; b = 2; c = 1,
\n" ); document.write( "\"a+=+%28-2+%2B-+sqrt%28+2%5E2-4%2A1%2A1+%29%29%2F%282%2A1%29+\"
\n" ); document.write( "Complete this like we did above, you will find that it is easy, everything inside the radical cancels out.
\n" ); document.write( "a = -1
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\n" ); document.write( "Substitute for a,b,c like we did in the 1st one
\n" ); document.write( "6x^2 + 5x -4 = 3x - 2
\n" ); document.write( "6x^2 + 5x - 3x - 4 + 2 = 0
\n" ); document.write( "6x^2 + 2x - 2 = 0
\n" ); document.write( "a = 6; b = 2; c = -2
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\n" ); document.write( "4x^2 - 14x - 27 = 3
\n" ); document.write( "4x^2 - 14x - 27 - 3 = 0
\n" ); document.write( "4x^2 - 14x - 30 = 0
\n" ); document.write( "a = 4; b =-14; c = -30\r
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