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-2(x + 5)(x - 6)
Two factors of 6 that add to -5? Try -2 & -3... (x - 2)(x - 3)
k(7k + 9)
You need to look for two numbers, which multiply to 6 and add to 5. Think about the factors of 6: 1 x 6, or 2 x 3, so try 2 & 3. (a + 3)(a + 2) is the solution.
It is: 12(2x+3) when factored