exam Maths Puzzle Numerical Ability

Add. Simplify by collecting like radical terms if possible, assuming that all expressions under radicals represent nonnegative numbers.

sqrt ( 7a ) + root ( 3, 28a^3 )

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exam Other Question

Please help me find the real and imaginary zeros to:
U(x)=x^4-4x^3+x^2+12x-12. Thanks. here is the problem 1 is less than or equal to -w/2
My question is in the answer the variable is switched to the
other side.
I am asking why?