book Maths Puzzle Numerical Ability

...2
21x -17xm + 2

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book Other Question

find the domain of the following functions by determining which numbers, if any, cannot be used:
1) f(x)=3x^2/(1+3x)
2) f(x)=(x^2+x-2)(x^2+4)

Thank you.
find four consescutive odd integers if the product of the two smaller integers is 112 less than product of the two larger integers.