If the square of 2x - ax + B decomposes the factor, we can get (2x-1) (x + 2) to find the value of a and B
(2x-1) (x + 2) is obtained by factoring 2x with the square - ax + B
∴﹛-a=3 a=-3
-2=b b=-2
∴a=-3, b=-2
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