book Maths Puzzle Numerical Ability

hi i need help for this equation and how to to arrive at the answer.

solve (find values) for A, B, C, D, F

(x^4 - 4x^2 - 7x - 28) = A(x^B + C)(x^D - F)

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book Other Question

This question is actually about elimination because there werent any catorgories for elimination. My question is:
0.5x+0.5y=-2
x-0.25y=6

My answer was (2.5,-14) but I don't th A jogger covers 3.5 miles in 28 minutes. Find the average speed of the jogger in miles per hour.