exam Maths Puzzle Numerical Ability

Please help factor my homework question. thanks!

12x^2+4x=5

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exam Other Question

The portion of the company�s fixed costs allotted to this product is $300, and the supplier�s cost for a set of tile is $6 each. Let x represent the number of tile sets.

If b re Completely factor the following: x^4 - 13x^2 + 36

This what I have done, please let me know if it is right, or not, what I did wrong thanks, lackinmath

(x^2-9)(x^2-4)
(x-3)(x+3)(x-2)(x+2)