If (a ‒ b), a and (a + b) are zeros of the polynomial 2x3 ‒ 6x2 + 5x – 7, write the value of a.
It is given in the question that, zero of the polynomial 2x3 – 6x2 + 5x - 7 is (a – b), a and (a + b)
Now by using the relationship between the zeros of the quadratic polynomial we have:
Sum of zeros = 
a – b + a + a + b = (- (-6))/2
3a = 3
a = 1
14