jika diketahui f(r)=2r-3 dan f(g(r))=2r pangkat 2 - 16r+1 . maka g(2)=.....

f(g(r)) = 2r^2 - 16r + 1
2(g(r)) - 3 = 2r^2 - 16r + 1
2(g(r)) = 2r^2 - 16r + 4
g(r) = r^2 - 8r + 2
g(2) = 2^2 - 8(2) + 2
g(2) = -10