4.0 × 10^{2} = 0.4 × 10^{3}

A number written in scientific notation has the form a×10^{{k}}, where 1 < a < 10 and k is an integer, that is, k is one of ... -3, -2 , -1, 0, 1, 2, 3....

Now consider the expression 4.0×10^{3} + 4×10^{2}. Determine the values of a and k when the value of this expression is written in scientific notation. Enter a and k, separated by commas.

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