exam Maths Puzzle Numerical Ability

Find a counterexample to the statement " The square of a number added to the sum of the number and five is a prime number."

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exam Other Question

What number should be added to complete the square of the following expression?

x^2+5/3x I need help to perform the indicated operation

f(x)=6x2+5x-6, g(x)=2x-8

I need to find(f og) 3/2