Question

split middle term and find zeros

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Answer 1

Answer:

$3 {x}^{2} - x - 4 = 0 \\ = 3 {x}^{2} - 4x + 3x - 4 = 0 \\ = x(3x - 4) + 1( 3x - 4) = 0 \\ = (3x - 4)(x + 1) = 0 \\ = x = \frac{4}{3} \: \: and \: \: - 1$

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Answer 2

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