exam Maths Puzzle Numerical Ability

Factor : x^2 - 8xy + 12y^2 = (x -2y)(x -6y) Is this correct?

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exam Other Question

factoring trinomials by trial and error
3x^2+16x-35
how do you solve these 2 problems.

9-6^2/4+12*4/2^4-3

789.3+4.287+13+2.9