If the quadratic power of a-ab-12b = 0, and B is not equal to 0, find 2a-b / 2A + B

The second power of a-ab-12b = 0
(a/b)²-(a/b)-12=0
∴(a/b-4)(a/b+3)=0
∴a/b=4 a/b=-3
2a-b\2a+b
=[2(a/b)-1]/[2(a/b)+1]
When a / b = 4, the original formula = (8-1) / (8 + 1) = 7 / 9
When a / b = - 3, the original formula = (- 6-1) / (- 6 + 1) = 7 / 5

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