book Maths Puzzle Numerical Ability

How do you simplify an equation like this {{{r^2+3s^2+8r+5^r2}}} ??? Please Help me

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book Other Question

what is 4(x-1)+2=18 ? showing the step-by-step process? Directions: Determine the least degree polynomial function with integral coefficients that gives the following roots:

2i

Thank you!