exam Maths Puzzle Numerical Ability

Find all positive values for k for which each of the following can be factored.

x(squared)+ x-k

thanks

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exam Other Question

Simplify the expression. Write the result using positive exponents only.

5^-1 + 2^-1
Find the roots of z^6=1 for z complex. Show that the sum of the roots you found is zero.