exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square?

x^2 + 8x - 16

yes or no

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exam Other Question

write the pattern using exponents: 2,4,8,16... Jon buys a new truck for $ 42700.The truck depreciates by 19&1/2% annually. What is the common ratio ratio for the value of the truck in successive years???
I think it is 0.195???