exam Maths Puzzle Numerical Ability

State which method should be applied as the first step for factoring the polynomial 6x^3+9x...

Factor completely...
1. 6b^4-18b^3-60b^2
2. 5a^2-125
3. y^3-12y^2+36y
4. b^2-ab-6a^2
5. 8m^4n-16mn^4

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exam Other Question

lines a and b are perpendicular. THe slope of line a is given. What is the slope of line b?

a is 1
I don't understand how to solve this problem.