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Functions (help!)
If x |---> 2x + 6
What does it mean when they ask me to find the set of all x (that is an element of) R (real numbers), that 2x + 6 = f(0)
Does it just want me to solve the equation 2x + 6 = 0?
How would i find ''the set of all x in R''? What does that bit mean?
Thanks
What does it mean when they ask me to find the set of all x (that is an element of) R (real numbers), that 2x + 6 = f(0)
Does it just want me to solve the equation 2x + 6 = 0?
How would i find ''the set of all x in R''? What does that bit mean?
Thanks
rpan161
If x |---> 2x + 6
What does it mean when they ask me to find the set of all x (that is an element of) R (real numbers), that 2x + 6 = f(0)
Does it just want me to solve the equation 2x + 6 = 0?
How would i find ''the set of all x in R''? What does that bit mean?
Thanks
What does it mean when they ask me to find the set of all x (that is an element of) R (real numbers), that 2x + 6 = f(0)
Does it just want me to solve the equation 2x + 6 = 0?
How would i find ''the set of all x in R''? What does that bit mean?
Thanks
Has the function f(x) been specifically defined anywhere ? I'm guessiong that it may just be f(x)=2x+6 but I'd like to check.
As for ''the set of all x in R'', this just means all possible real values of x. Have you encountered complex numbers yet?
First of all, what's f(0)? This is all a matter of notation. A function can be written as the mapping:
...
-1 ---> f(-1)
0 --- > f(0)
0.125 ---> f(0.125)
...
...
x ----> f(x)
...
...
In other words, f(x) is defined to be whatever thing the function maps the element x to. Well here, you have
0 ----> 2*0 + 6
So conclude f(0) = 2*0 + 6 = 6.
...
-1 ---> f(-1)
0 --- > f(0)
0.125 ---> f(0.125)
...
...
x ----> f(x)
...
...
In other words, f(x) is defined to be whatever thing the function maps the element x to. Well here, you have
0 ----> 2*0 + 6
So conclude f(0) = 2*0 + 6 = 6.
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