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Show that *: R xxR ->Rdefined by a*b = ...

Show that ` *: R xxR ->R`defined by `a*b = a +2b`is not commutative.

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`a ** b = a+ 2b = 3 +10 = 13`
`b ** a = b+ 2a = 5+6 = 11`
`a=3, b=5`
`a** b cancel(=) b ** a`
hence proved
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