exam Maths Puzzle Numerical Ability

Can you please help me: a^2+4a+21 please help me solve this

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exam Other Question

Can I take average of a complex number and a real number?
i.e. [(a+bi)+c]/2=? evaluate the funtions for the values of x given as 1, 2, 4,8, and 16 describe the differences in the rate at which each function changes with increasing values of x
1. f(x)=5x-3