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x-> (-3)
=(x+6)(x+3)/3(x+3)
=(x+6)/3
=((-3)+6)/3
=3/3
=1 [A]
x² + 9x + 18
3x + 9
Turunkan :
2x + 9
3
masukkan nilai -3 ke dalam x
2(-3) + 9
3
-6 + 9
3
3
3
= 1