exam Maths Puzzle Numerical Ability

Write the trinomial in descending power of one variable, and then factor it.

-a^2+4b^2+3ab

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exam Other Question

how many sides in one point?what is the formula of that? Jon buys a new truck for $42700. The truck depreciates by 19&1/2 % annually. What is the common ratio for the value of the truck in successive years? I think it may be 0.805 or 0.1