Diketahui fungsi f(x) = 3(x-2) dan f(a) = -21, maka nilai a adalah .... a. -6 b. -5 C. 5 d. 6
tolong ksi cara
tolong ksi cara
f(x) = 3(x–2)
f(a) = -21
3(x–2) = -21
(x–2) = -21 : 3
(x–2) = -7
x = -7+2
x = -5
jadi jawabanya -5
pembuktian
f(x) = 3(x–2)
f(-5) = 3(-5-2)
f(-5) = 3(-7)
f(-5) = -21
Kurang lebih kek gitu kayaknya
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