exam Maths Puzzle Numerical Ability

explain to me how you solve x+3/2=15

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exam Other Question

hello please help me i dont understand this proof im confused thanks alot i appreciate it

u need the book to solve it

its Problem number 20 on page 138 I need help with this question and I have absolutely no clue how to do it. It states: find all the zeros of the function: x^3+3x^2-x+12