document.write( "Question 1080571: Use the elimination method to find the TWO solutions of this system. Mark TWO answers.\r
\n" ); document.write( "\n" ); document.write( "{y=9(x+4)^2 – 81
\n" ); document.write( "{y=−9(x+4)^2+81\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "(3, 0)
\n" ); document.write( "
\n" ); document.write( "(-3, 0)
\n" ); document.write( "
\n" ); document.write( "(5, 0)
\n" ); document.write( "
\n" ); document.write( "(-1, 0)
\n" ); document.write( "
\n" ); document.write( "(-7, 0)
\n" ); document.write( "
\n" ); document.write( "(-9, 0)
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #694703 by MathTherapy(10552)\"\" \"About 
You can put this solution on YOUR website!
Use the elimination method to find the TWO solutions of this system. Mark TWO answers.\r
\n" ); document.write( "\n" ); document.write( "{y=9(x+4)^2 – 81
\n" ); document.write( "{y=−9(x+4)^2+81\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "(3, 0)
\n" ); document.write( "
\n" ); document.write( "(-3, 0)
\n" ); document.write( "
\n" ); document.write( "(5, 0)
\n" ); document.write( "
\n" ); document.write( "(-1, 0)
\n" ); document.write( "
\n" ); document.write( "(-7, 0)
\n" ); document.write( "
\n" ); document.write( "(-9, 0)
\n" ); document.write( "
\"y+=+9%28x+%2B+4%29%5E2+-+81\" ------- eq (i)
\n" );
document.write( "\"y+=+-+9%28x+%2B+4%29%5E2+%2B+81\" ----- eq (ii)
\n" );
document.write( "2y = 0 ------- Adding eqs (ii) & (i)
\n" );
document.write( "y = 0\r
\n" );
document.write( "\n" );
document.write( "\"0+=+9%28x+%2B+4%29%5E2+-+81\" ------- Substituting 0 for y in eq (i)
\n" );
document.write( "\"81+=+9%28x+%2B+4%29%5E2\" ---------- Adding 81 to both sides
\n" );
document.write( "\"9+=+%28x+%2B+4%29%5E2\" ------------- Dividing each side by 9
\n" );
document.write( "\"%22%22+%2B-+sqrt%289%29+=+sqrt%28%28x+%2B+4%29%5E2%29\" -------- Taking square root of both sides
\n" );
document.write( "\"matrix%281%2C3%2C+%22%22+%2B-+3%2C+%22=%22%2C+x+%2B+4%29\"
\n" );
document.write( "\"x+=+%22%22+%2B-+3+-+4\"
\n" );
document.write( "x = 3 - 4,    OR      x = - 3 - 4
\n" );
document.write( "x = - 1       OR      x = - 7
\n" );
document.write( "Solutions: 
\n" );
document.write( "That's how SIMPLE this is!! \n" );
document.write( "
\n" );