If a – b, a and a + b are zeroes of the polynomial x^3 – 3x^2 + x + 1 the value of (a + b) is:
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sum of zeroes= -coeff of x^2/coeff of x^3
a+b+a+a-b=3
a=1
zeroes are 1-b,1,1+b
product of zeroes=1-b^2=1
b=0
a+b=1
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