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B. f(3) = 3^2 + 3(3) - 5 = 13
f(-3) = (-3)^2 + 3(-3) - 5 = -5
C. f(x) = x^2 + 3x - 5 = 5
f(x) = x^2 + 3x - 10 = 0
f(x) = (x + 5) (x - 2)
x = -5 dan x = 2