book Maths Puzzle Numerical Ability

Please help me factor this-please show me the steps

3x^2 + 2x - 16

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book Other Question

Find the values of the polynomials for the given value of the variable

-x^2 - 5x - 6

when x = -2

I get confused when substituting -2 for the first value when it is a negative x^2 Articles are bought at rs. 42 a dozen and sold at rs. 85 a score. what is the profit per cent?