Dik: f(x)= -2 +7 dan f(k)=17,maka nilai k adalah…

F(x) = -2 + 7
f(k) = 17
f(k) = -2 + 7 = 17
f(k) = -2 = 17-7
f(k) = -2 = 10
f(k) = 10+2
f(k) = 12

btw soalnya udh bener ka? gaada yg ketinggalan?