document.write( "Question 411279: How do I plug my answer into the equation to check my answer, by using paper and pencil not the calculator?\r
\n" ); document.write( "\n" ); document.write( "10x^2+40=80x
\n" ); document.write( "10x^40-80x=80x-80x=0
\n" ); document.write( "10x^2-80x+40=0
\n" ); document.write( "-80+-sqrt((80)^2-4(10)(40))/(2(10))
\n" ); document.write( "-80+-sqrt(6400-1600)/(20)
\n" ); document.write( "-80+-sqrt(4800)/(20)
\n" ); document.write( "-80+-sqrt((100(4)(12))/(20)
\n" ); document.write( "-80+- 10(2) sqrt(12)/(20)
\n" ); document.write( "-80+- 20 sqrt(12)/(20)
\n" ); document.write( "-40+- 1 sqrt(3)/(5)
\n" ); document.write( "-40+- sqrt (3)/(5)
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #289136 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
How do I plug my answer into the equation to check my answer, by using paper and pencil not the calculator?
\n" ); document.write( "10x^2+40=80x
\n" ); document.write( "10x^40-80x=80x-80x=0
\n" ); document.write( "10x^2-80x+40=0
\n" ); document.write( "========================== Simplify it here
\n" ); document.write( "x^2 - 8x + 4 = 0 **** It's +8, -b/2a
\n" ); document.write( "x = +8/2 ± sqrt(64 - 16)/2
\n" ); document.write( "= 4 ± 2sqrt(3)
\n" ); document.write( "-----------------
\n" ); document.write( "-80+-sqrt((80)^2-4(10)(40))/(2(10))
\n" ); document.write( "-80+-sqrt(6400-1600)/(20)
\n" ); document.write( "-80+-sqrt(4800)/(20)
\n" ); document.write( "-80+-sqrt((100(4)(12))/(20)
\n" ); document.write( "-80+- 10(2) sqrt(12)/(20)
\n" ); document.write( "-80+- 20 sqrt(12)/(20)
\n" ); document.write( "-40+- 1 sqrt(3)/(5)
\n" ); document.write( "-40+- sqrt (3)/(5)
\n" ); document.write( " \n" ); document.write( "
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