If all the three equations x^2+ax+10=0, ...

If all the three equations` x^2+ax+10=0`, `x^2+bx+8=0` and `x^2(2a+3b)x+60=0`, where a,b`in`R have a common root, then a value of `(a-b)` can be (A) -1 (B) 0 (C) 1 (D) 2

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