(3x)^(2-4) = (3x)^-2 = (9x2)^-1 = 1/(9x2)
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The only common factor of those two terms is the number three, giving you: 3(x3 - 8y3)
2 to the 2 power = 4 -3 to the 2 power = 9 4 to the 2 power = 16 You don't indicate what to do to the 4, but 9 + 16 = 25
2
It is: 2 to the power 4 times 7 to the power 2 = 784
2 to the power of 4 is an expression, it is not an equation.