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f(2) = 1
1 = 2m + n
f(-2) = -7
-7 = -2m + n
2m + n = 1
-2m + n = -7 -
4m = 8
m = 2
2m + n = 1
4 + n = 1
n = -3
f(x) = 2x - 3
f(-3) = -6 - 3
f(-3) = -9
f(2) = 2m+n = 1....(1)
f(-2) = -2m+n = -7....(2)
Jumlahkan kedua persamaan :
2n = -6
n = -3
2m-3 = 1
m = 2
f(-3) = -3.2-3
f(-3) = -6-3 = -9/a