book Maths Puzzle Numerical Ability

Q. If one complex zero of a quadratic equation is 2 + i, what is the quadratic equation in ax^2 + bx + c = 0
thanks, Mike

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please find the lowest common denominator of 3/4 and 5/8 thank you

a. 32
b. 16
c. 8
d. 4
Let f= 1 2 3 4 5
2 3 1 5 4

and

g= 1 2 3 4 5
3 4 2 5 1.

What is f inverse -1?
Write fog as a product of disjoint cycles.Is fog even?why?