Pertanyaan tentang fungsi nih... (Beserta Cara ya...) 1. diketahui fungsi f(x) = ax + 5, f(1) = 7, dan f(k) = 1. nilai k adalah?... a. -2 b. -1 c. 0 d. 1 2. diketahui fungsi f(x) = mx + n. Jika f(-1) = 2 dan f(2) = 11, maka nilai f(4) adalah? a. 17 b. 28 c. 37 d. 60 3. diketahui rumus fungsi f(x) = 3x + 2, dan f(4y - 17) adalah? a. 12y - 23 b. 12y - 19 c. 12y - 11 d. 12y - 5
tribeking22
1. f(1) = 7 a . 1 + 5 = 7 a + 5 = 7 a = 7 - 5 a = 2
a . 1 + 5 = 7
a + 5 = 7
a = 7 - 5
a = 2
f(x) = 2x + 5
f(k) = 1
2k + 5 = 1
2k = 1 - 5
2k = -4
k = -4 : 2
k = -2
Jawaban: A
2. f(-1) = 2
-m + n = 2
f(2) = 11
2m + n = 11
2m + n = 11
-m + n = 2 -
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3m = 9
m = 9 : 3
m = 3
-m + n = 2
-3 + n = 2
n = 2 + 3
n = 5
f(x) = 3x + 5
f(4) = 3 . 4 + 5
f(4) = 12 + 5
f(4) = 17
Jawaban: A
3. f(x) = 3x + 2
f(4y - 17) = 3(4y - 17) + 2
f(4y - 17) = 12y - 51 + 2
f(4y - 17) = 12y - 49