document.write( "Question 1065655: Find the real solutions of the equation 2x4 - 128x2 = 0 by factoring.
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Algebra.Com's Answer #680833 by rothauserc(4718) $\"\"$ $\"About$

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2x^4 - 128x^2 = 0
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\n" ); document.write( "factor 2x^2
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\n" ); document.write( "2x^2 * (x^2 - 64) = 0
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\n" ); document.write( "we have two cases
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\n" ); document.write( "1) 2x^2 = 0
\n" ); document.write( "x = 0
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\n" ); document.write( "2) x^2 - 64 = 0
\n" ); document.write( "x = 8 and x = -8
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\n" ); document.write( "x = 0, 8, -8
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\n" ); document.write( "check our answers
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\n" ); document.write( "(2 * 0^4) - (128 * 0^2) = 0
\n" ); document.write( "0 = 0
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\n" ); document.write( "(2 * 8^4) - (128 * 8^2) = 0
\n" ); document.write( "8192 - 8192 = 0
\n" ); document.write( "0 = 0
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\n" ); document.write( "(2 * (-8)^4) - (128 * (-8)^2) = 0
\n" ); document.write( "8192 - 8192 = 0
\n" ); document.write( "0 = 0
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\n" ); document.write( "our answers check
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