If a and B are the zeroes of x2 - x -2 , from a quadratic polynomial in x where zeroes are 2aB +1
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x2-x-2
x2-2x+x-2
x(x-2)+1(x-2)
(x+1)(x-2)
x=-1 and +2
2aB+1=2*-1*2+1= -3
x2-2x+x-2
x(x-2)+1(x-2)
(x+1)(x-2)
x=-1 and +2
2aB+1=2*-1*2+1= -3
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