SOLUTION: I don't actually know what the question is asking me. If f(x) = 7x^2-2x+5 find a f(-1/5) b f(p^3) Am I supposed to be finding range/domain or actually plotting this on a grap

Algebra ->  Graphs -> SOLUTION: I don't actually know what the question is asking me. If f(x) = 7x^2-2x+5 find a f(-1/5) b f(p^3) Am I supposed to be finding range/domain or actually plotting this on a grap      Log On


   



Question 1047471: I don't actually know what the question is asking me.
If f(x) = 7x^2-2x+5 find
a f(-1/5)
b f(p^3)
Am I supposed to be finding range/domain or actually plotting this on a graph? I hate these kinds of questions, I need it to be spelled out exactly what I'm trying to find.

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

If f%28x%29+=+7x%5E2-2x%2B5
find:
a. f%28-1%2F5%29-> means you are given value of x and it is %28-1%2F5%29
so, plug it in f%28x%29+=+7x%5E2-2x%2B5
f%28-1%2F5%29+=+7%28-1%2F5%29%5E2-2%28-1%2F5%29%2B5
f%28-1%2F5%29+=+7%281%2F25%29%2B2%2F5%2B5
f%28-1%2F5%29+=+7%2F25%2B2%2F5%2B5
f%28-1%2F5%29+=+7%2F25%2B10%2F25%2B125%2F25
f%28-1%2F5%29+=+142%2F25
or, approximately f%28-1%2F5%29+=+5.68

b f%28p%5E3%29 -> means you are given value of x and it is %28p%5E3%29
so, plug it in f%28x%29+=+7x%5E2-2x%2B5
f%28p%5E3%29+=+7%28p%5E3%29%5E2-2%28p%5E3%29%2B5
f%28p%5E3%29+=+7p%5E6-2p%5E3%2B5