document.write( "Question 102979This question is from textbook Longman Mathematics for IGCSE Maths
\n" ); document.write( ": 2= sqr22-8x^2 \n" ); document.write( "
Algebra.Com's Answer #74900 by edjones(8007)\"\" \"About 
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\"2=sqrt%2822%29-8x%5E2\" I assume this is the problem.
\n" ); document.write( "8x^2+2=sqrt(22)
\n" ); document.write( "64x^4+32x^2+4=22 Square both sides.
\n" ); document.write( "64X^4+32x^2-18=0
\n" ); document.write( "32x^4+16x^2-9=0 divide each side by 2.
\n" ); document.write( "32x64+16x^2 =9
\n" ); document.write( "x^4+.5x^2+.0625=9/32+.0625 Complete the square on the left by dividing each side by 32 an adding .0625 to each side.
\n" ); document.write( "(x^2+.25)^2=11/32
\n" ); document.write( "x^2+.25=sqrt(11/32)
\n" ); document.write( "x^2=-.25+-sqrt(11/16*2)
\n" ); document.write( "x^2=(-1+-sqrt(11/2))/4
\n" ); document.write( "x=+-sqrt(-1-sqrt(11/2))/2 gives non real results
\n" ); document.write( "x=+-sqrt(-1+sqrt(11/2))/2=+-.579915
\n" ); document.write( "\"graph%28500%2C500%2C-5%2C5%2C-5%2C5%2Csqrt%2822%29-8x%5E2-2%29\"
\n" ); document.write( "Ed\r
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