Question

evaluate the function at the given values of x, if possible. f(x)=7x^2-1 over x^2 a. x=3 b. x=-1
Can someone help me solve this

Answer 1

\[f(3)=\frac{7\times 3^2-1}{3^2}=\frac{7\times 9-1}{9}=\frac{63-1}{9}=\frac{62}{9}\]

Answer 2

so that is the first one

Answer 3

yes. for the second one replace x by -1
still need help or you got it?

Answer 4

no still need help. i dont even know where to begin

Answer 5

:(

Answer 6

where you see an x, put in the number

Answer 7

replace it. so for example of
\[f(x)=x^2\] then
\[f(3)=3^2\]and if
\[f(x)=\frac{x-1}{x}\] then
\[f(3)=\frac{3-1}{3}\]

Answer 8

in your case
\[f(x)=\frac{7x^2-1}{x^2}\] so
\[f(-1)=\frac{7\times (-1)^2-1}{(-1)^2}=\frac{7\times 1-1}{1}=7-1=6\]

Answer 9

OMG! This is such jiberish

Answer 10

Thanks