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Question 1065655: Find the real solutions of the equation 2x4 - 128x2 = 0 by factoring.
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! 2x^4 - 128x^2 = 0
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factor 2x^2
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2x^2 * (x^2 - 64) = 0
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we have two cases
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1) 2x^2 = 0
x = 0
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2) x^2 - 64 = 0
x = 8 and x = -8
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x = 0, 8, -8
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check our answers
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(2 * 0^4) - (128 * 0^2) = 0
0 = 0
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(2 * 8^4) - (128 * 8^2) = 0
8192 - 8192 = 0
0 = 0
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(2 * (-8)^4) - (128 * (-8)^2) = 0
8192 - 8192 = 0
0 = 0
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our answers check
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