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

Determine whether T: R�2→R�2 is a linear operator
1. T(x, y)=(2x+y, x-y)
2. T(x, y)=(x+1, y)
3. T(x, y)=( y, y)
4. T(x, y)=(x1/3, y1/3)

Thank you very much Combine like terms: 6X2 + 3X -2 + 2X2 - X + 7
A) 10X + 5 B) 8X2 + 2X + 5 C) 4X2 + 4X - 9 D) 10X + 9