book Maths Puzzle Numerical Ability

im doing a crossword puzzle for math and fogot my book at school do u know what are parenthese or brackets called? it a 15 letter word(s)starts with g and second is o 11 is m and 1

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book Other Question
This section is dealing with contradictions.

Show that the product of a non-zero rational number and an irrational number is an irrational number. find the roots of x^3-0.165x^2+3.993*10^(-4)=0