I need help finding the domain and simplifying these functions:
1.) F (x)= 3x - 8 OVER 4x + 20
2.) -7xy^2 OVER 28x^5y
3.) x - 2 OVER 8x^2 - 32
1.) F (x)= 3x - 8 OVER 4x + 20
2.) -7xy^2 OVER 28x^5y
3.) x - 2 OVER 8x^2 - 32
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the domain is anywhere except where the function is not defined. if the denominator equals 0 it is undefined so the domain of 1) is all real numbers except where 4x+20=0 so all real numbers x except where x=-5
2) all real numbers x,y except where 28x^5y=0. this equals zero only when either x or y or both = 0
see if you can do the last one :)
2) all real numbers x,y except where 28x^5y=0. this equals zero only when either x or y or both = 0
see if you can do the last one :)