diketaui rumus f(x)=2x-5. jika f(k)=-15, maka nilai k adalah...

f(k) = -15
2k-5 = -15
2k = -10
k = -5

dik = o) f(x)=2x-5, o) f(k)=-15
dit = nilai k?
jwb.
f(x)=f(k)
2x-5 = -15
2x = -15 + 5
2x = -10
x = -10/2 = -5