book Maths Puzzle Numerical Ability

Can you explain how to solve this in detail? Thank you.

Factor completely:
4x2 - 36y2

Factor completely:
3x2 - 2x - 8

Factor completely:
24x2 + 10x - 4

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book Other Question

CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____ looking desperately for the answer to this:

6x to the second power - 12x - 18 = ????

Please help... thank you, krista m pooler