exam Maths Puzzle Numerical Ability

factoring trinomials by trial and error
3x^2+16x-35

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exam Other Question

In the figure above, FD||AC and EF||CB. Prove that angle C is congruent to angle EFD and that angle CEF is congruent to angle FDC. Factor : x^2 - 8xy + 12y^2 = (x -2y)(x -6y) Is this correct?