SOLUTION: Can you help me find the domain for the following? f(x)=sqrt x-8 h(x)=3x^2+5x-3 m(x)=5/x^2-9 l(x)=5x-4 g(x)=7x+4/x+4

Question 147476: Can you help me find the domain for the following?
f(x)=sqrt x-8
h(x)=3x^2+5x-3
m(x)=5/x^2-9
l(x)=5x-4
g(x)=7x+4/x+4
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
f(x)=sqrt(x-8)
All real numbers >=8 sqrt of negative numbers are not real (imaginary).

.
h(x)=3x^2+5x-3
all real numbers.

.
m(x)=5/(x^2-9)
5/(x+3)(x-3)
All real numbers except when x=3 or x=-3 (division by zero not allowed)

.
l(x)=5x-4
All real numbers.

.
g(x)=7x+4/x+4
All real numbers except x=-4 (division by zero not allowed)

.
Ed

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