Question

F(x)=2x -3, jika f(a)=7. maka nilai a adalah

Answer 1

F(x) = 2x - 3
f(a) = 7

  7 = 2a - 3
+3 =      +3    +
10 = 2a
2a = 10
  a = 5

Maka, nilai a adalah 5

Answer 2

F(x) = 2x -3

f(a) =7
2x-3 = 7
2x    = 7+3
2x   = 10
  x   = 5

a = 5

2x-3 = 7
2(5)-3 = 7
10-3  = 7
     7 = 7  {terbukti}