17. diketahui rumus fungsi f(x)= -2x + 7. Jika f(k) =11, maka nilai k adalah

f(x) = - 2x+7

f(k) = - 2k+7
11 = - 2k +7
2k = 7-11
2k = - 4
k = - 4/2
k = - 2

f(x) = -2x + 7
==> f(k) = -2k + 7
==> 11 = -2k + 7
==>11-7 = -2k
==> 4/-2 = k
==> -2 = k