Question

#Diketahui fungsi f(x)=2x+5. Jika f(k)=13,maka nilai dari k adalah....

Answer 1

F(x) = 2x+5
f(k) = 13

f(k) = 2k + 5
13 = 2k + 5
13 - 5 = 2k
8 = 2k
8/2 = k
4 = k

Answer 2

F(x) = 2x + 5
f(k) = 13
 13 = 2k + 5
 2k = 13 - 5
 2k = 8
   k = 4