book Maths Puzzle Numerical Ability

i was wondering how you find the inverse of the following problems:


f(x)= x+8
f(x)= 2x^4,_<0
f(x)= -x^5=6

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book Other Question

determine the sum for the geometric sequence:
n=12 , r=3 , T1 = 1/9
how do you find the zeros of polinomial?