2 answers
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What is your problem?
2 to 4th power x 2 -2 ?
Is this your problem?
2^4 * 2^(-2)
If so,
2^4 = 16
2^(-2) = 1/(2^2) = 1/4
2^4 * 2^(-2) = 16 * 1/4 = 16/4 = 4
4 = 2^2