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Dit : f(-3) = ....?
Jawab:
f⁻¹ (x) = 2x / 3 - x
∴ f⁻¹ (y) = 2y / 3 - y
x = 2y / 3 - y ⇔ 2y = x(3 - y)
2y = 3x - xy
y = 3x - xy / 2
f(x) = 3x - xy / 2
f(-3) = 3(-3) - (-3)y / 2
= -9 - (-3y) / 2
= -3(3 - y) 2
Maaf bila ada kesalahan dan semoga membantu