document.write( "Question 451671: x^2-1=8 solve using square roots \n" ); document.write( "

Algebra.Com's Answer #310569 by pedjajov(51) $\"\"$ $\"About$

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This can be written as\r
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\n" ); document.write( "\n" ); document.write( " $\"x%5E2-1-8=0\"$
\n" ); document.write( " $\"x%5E2-9=0\"$ , this is now difference of two squared numbers, x and 3
\n" ); document.write( " $\"x%5E2-3%5E2=0\"$ , this is product of sum and differnce x and 3
\n" ); document.write( " $\"%28x%2B3%29%28x-3%29=0\"$ \r
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\n" ); document.write( "\n" ); document.write( "So it can be\r
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\n" ); document.write( "\n" ); document.write( " $\"x%2B3=0\"$ -> x=-3
\n" ); document.write( " $\"x-3=0\"$ -> x= 3\r
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\n" ); document.write( "\n" ); document.write( "We say roots of this quadratic equation are 3 and -3. \n" ); document.write( "

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