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The Law of Quadratic Term in Senior Two Mathematics
The coefficient of odd terms, that is, the degree of x, is odd.

Even term coefficient, that is, the degree of x is even.

Let x= 1, then the odd term coefficient+even term coefficient = (1+1+) 4 = 256.

Let x=- 1, then even term coefficient-odd term coefficient = (1-1+1) 4 = 0.

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2 times the odd term coefficient =256

The sum of odd-numbered coefficients is 128.

The answer is 128.