1.) Rumus fungsi f:x=x²-1 kemudian nilai fungsi untuk x=-4 dan x=3 adalah......... a. 8dan -15. c. -8dan-15
b. 8dan15. d. -8dan15
2.) Suatu fungsi f dinyatakan oleh f:x=4x jika domainnya {-2,-1,0,1,2} maka range fungsinya adalah.... a.{6,5,4,-3,2} c. {6,-5,4,3,2} b.{6,5,4,3,2} d. {6,5,-4,3,2}
Verified answer
Jawab :1) f(x) = x² - 1
f(-4) = (-4 + 1)( - 4 - 1)
= -5(-3)
= 15
f(x) = x² - 1
f(3) = (3 + 1)(3 - 1)
= 4(2)
= 8
2) Domain : {-2, -1, 0, 1, 2}
f(-2) = 4(-2) = -8
f(-1) = 4(-1) = -4
f(0) = 4(0) = 0
f(1) = 4(1) = 4
f(2) = 4(2) = 8