exam Maths Puzzle Numerical Ability

I need to know how to factor the GCF from the polynomial
15x^8+11x^7
Please help me

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exam Other Question

If the legnth of one side of a rectangle is 8 and the legnth of a diagonal is 10 , find the area of the rectangle. 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