exam Maths Puzzle Numerical Ability

Given f(x)=2x+2, find f(-1)

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exam Other Question

9a^2- 64b^2

I tried to work this out but i am not sure this is correct can you let me know. thank you
(3a+8b)(3a-8b)
Tutors Please help! thank you

Find each of the following to four decimal places using a calculator
e^6 and (1/e^2)^2