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You need to find 2 numbers whose product totals 128. One of the numbers needs to be a perfect square so we can simplify it.
 one year ago

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I ways like to divide it by 2 first to see if 2 and the other number will work. Good place to start
 one year ago

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2 times 64 = 128, Hey look.. 64 is a perfect square!!
 one year ago

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\[\sqrt{128}=\sqrt{2 \times 64}=\sqrt{2}\sqrt{64}=8\sqrt{2}\]
 one year ago
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