An expression is given: 2(√-1) +√8If on adding -8√2 to the expression
results in a rational number, what is the value of k?
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Subtraction is not commutative because switching around the numbers in the operation yields a different solution. For example, because . The operations addition and multiplication are commutative, because no matter what order you place the numbers in, you will always get the same sum/product.
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