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Here, with probably a lot more steps than required, is the answer:

[2*sqrt(5)]*[4*sqrt(10)]=2*4*sqrt(5)*sqrt(10)

= 8*sqrt(5)*sqrt(10)

= 8*sqrt(5*10)

= 8*sqrt(5*5*2)

= 8*5*sqrt(2)

= 40*sqrt(2)

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9y ago

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