Question

for f(x)=2x^2+2x-6, find f(k-1)

Answer 1

put x=k-1

Answer 2

just replace x with k-1
\[\implies f(k-1) = 2(k-1)^2 + 2(k-1) - 6\]
simplify to get the final answer

does that help?

Answer 3

Yes that does! I wasnt sure if that was all I had to do

Answer 4

like i said..you still ahve to expand it