book Maths Puzzle Numerical Ability

Find the irrational roots of the equation x^3-4x^2+2x+1=0

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book Other Question

For right ABC, angle A = 33 degrees, c = 14. Find a. the ratio of salaries of a and b is 150%. if the salary of a increases by 20% and the ratio given decreases by 30 percentage points, what is the % increase/decrease in the salary of b