exam Maths Puzzle Numerical Ability

Please help me find the real and imaginary zeros to:
U(x)=x^4-4x^3+x^2+12x-12. Thanks.

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exam Other Question

give an example of a rational number that is not an integer. Add. Simplify by collecting like radical terms if possible, assuming that all expressions under radicals represent nonnegative numbers.

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