document.write( "Question 570457: what is the equation for; 3 times the difference of the square of a number and 1 is 72 \n" ); document.write( "
Algebra.Com's Answer #367700 by ankor@dixie-net.com(22740)\"\" \"About 
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what is the equation for; 3 times the difference of the square of a number and 1 is 72
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\n" ); document.write( "Write what it says
\n" ); document.write( "3(x^2-1) = 72
\n" ); document.write( "3x^2 - 3 = 72
\n" ); document.write( "3x^2 = 72 + 3
\n" ); document.write( "3x^2 = 75
\n" ); document.write( "divide both sides by 3
\n" ); document.write( "x^2 = 25
\n" ); document.write( "x = 5
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\n" ); document.write( "Check this
\n" ); document.write( "3(5^2-1) = 72
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