exam Maths Puzzle Numerical Ability

find a polynomial with leading coefficent 1 and degree 3 that has -1,11, and 3 as roots

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I don't know how to solve this system. I know I should get 3 answers.
x+3y-z=-1
3x+2y+z=4
2x+5y+3z=-1
What is the last operation that takes place in evaluating -16?
@ The Order of Operations requires exponents to be evaluated first, and exponents only apply to whatever they are i