exam Maths Puzzle Numerical Ability

The roots of the equation (q-r)x^2+(r-p)x+(p-q)=0 are
(a) r-p/q-r,1 (b)p-q/q-r,1 (c) q-r/p-q ,1 (d) r-p/p-q,1

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exam Other Question

I need to know how to factor the GCF from the polynomial
15x^8+11x^7
Please help me
solve for r: A="pie"r"squared"