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The sum of the coefficients is 3 - 7 + 4 = 0 so (x - 1) is a factor.

Thus,

3x2 - 7x + 4 = 3x2 - 3x - 4x + 4 = 3x(x - 1) - 4(x - 1) = (3x - 4)(x - 1)

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Q: What are the factors of 3x squared minus 7x plus 4?
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