if 1/3 is one zero of 3x2 + 5x - 2, then find the other zero value.
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3x² + 5x - 2
= 3x² + 3x - 2x - 2
= 3x(x + 1) - 2(x + 1)
= (3x - 2)(x + 1)
to find zeroes,
(3x - 2)(x + 1) = 0
3x - 2 = 0 or x + 1 = 0
x = ⅔ or x = -1
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