SOLUTION: Hello I need hepl with this equation. f(x)=-5x+8 at f(-3), and f(x)=3xsqr.-4x-3 at f(x-1)

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Hello I need hepl with this equation. f(x)=-5x+8 at f(-3), and f(x)=3xsqr.-4x-3 at f(x-1)      Log On


   

Question 179402: Hello I need hepl with this equation. f(x)=-5x+8 at f(-3), and f(x)=3xsqr.-4x-3 at f(x-1)
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
What you are being asked to do is evaluate an expression/function at a specific value of x.
f%28x%29+=+-5x+%2B8 at the vlauex=-3
So plug in -3 for x everywhere in the equation. Then solve it
f%28x%29+=+-5x+%2B8
f%28-3%29+=+-5%28-3%29+%2B8
f%28-3%29+=+15+%2B+8
f%28-3%29+=+23
Use the same process for the second problem.
f%28x%29=3x%5E2-4x-3 at x=-1
f%28-1%29+=+3%28-1%29%5E2+-4%28-1%29+-+3
f%28-1%29+=+3%281%29+%2B+4+-+3
f%28-1%29+=+3+%2B+1
f%28-1%29+=+4
get it?