document.write( "Question 924380: twice the square of a certain positive number added to 2 times the number make 84.find the number? \n" ); document.write( "
Algebra.Com's Answer #560842 by Cromlix(4381)\"\" \"About 
You can put this solution on YOUR website!
twice the square of a certain positive number added to 2 times the number make 84.
\n" ); document.write( "2 (x)^2 + 2(x) = 84
\n" ); document.write( "2x^2 + 2x = 84
\n" ); document.write( "2x^2 + 2x - 84 = 0
\n" ); document.write( "Divide thro'out by 2
\n" ); document.write( "x^2 + x - 42 + 0
\n" ); document.write( "(x + 7)(x - 6) = 0
\n" ); document.write( "x + 7 = 0
\n" ); document.write( "x = -7 No answer as negative
\n" ); document.write( "x - 6 = 0
\n" ); document.write( "x = 6 This is your answer.
\n" ); document.write( "2 (6)^2 + 2(6) = 84
\n" ); document.write( "2(36) + 12 = 84
\n" ); document.write( "72 + 12 = 84.\r
\n" ); document.write( "\n" ); document.write( "Hope this helps.
\n" ); document.write( ":-) \n" ); document.write( "
\n" );