book Maths Puzzle Numerical Ability

solve inequalities.
A. x^3-x^2-4x+4<0
B.3x^2-7x+2 <0
x+1

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book Other Question

f(x)=3^X, find the value of X that makes f(x)=17, then explain how you know the answer must be between 2 and 3 Locate the foci with this equation:

(x-5)*/5* + (y-3)*/10*

KEY:
*= squared. (EX: 5squared)