SOLUTION: Please help me solve this let f(x) = 1/x^2+7x+12. Evaluate f(-2) and find the domain of f.

Algebra ->  Equations -> SOLUTION: Please help me solve this let f(x) = 1/x^2+7x+12. Evaluate f(-2) and find the domain of f.      Log On


   

Question 851235: Please help me solve this
let f(x) = 1/x^2+7x+12. Evaluate f(-2) and find the domain of f.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

f(x) = 1%2F%28x%5E2%2B7x%2B12%29

f(-2) = 1%2F%284-14%2B12%29+=+1%2F2

finding When Denominator = 0 (NOT possible)

x^2+7x+12 = 0     Factoring

(x+4)(x+3)= 0, x = -4  0r x = -5

Domain is all real numbers such that x  ≠  -4, -5