Tlong bntu yg no.8 yh,, mksih

f(x) = (2k+1)x+7
f(-1) = (2k+1)(-1)+7 = -4
  -2k - 1 + 7 = -4
  -2k + 6 = -4
  -2k = -4 - 6
  -2k = -10
  k = 5

f(x) = (2(5)+1)x+7
f(x) = (10+1)x+7
f(x) = 11x+7
f(k) = 11k+7  >> k = 5
f(5) = 11(5) + 7
  = 55 + 7 
  = 62

Jawaban : a

 semoga membantu :)