exam Maths Puzzle Numerical Ability

Can anyone give me some help with this? I need the steps and solution:

Factor each polynomial


aČ - a - 35

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exam Other Question

Need help,
5^2x=5^(x^2-12) The parenthesis means the exponent of 5.
For the first step I have 2xln5=(x^2-12)ln5 but now I'm not sure how to finish the problem.
Given: segmant FC is parallel to segment ED
Segment FE is parallel to segment CD

Prove: triangle FEC is congruent to triangle DCE