positive and negative real zeros of 3x³ +x³ -23x +12
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[tex]3x^{3} + x^{3} - 23x + 12 \\ \\ = {3x}^{3} + 1x ^{3} - 23x + 12 \\ \\ = (3 + 1) {x}^{2} - 2x + 12 \: \: \: \\ \\ = {4x}^{3} - 23x + 12 \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]