If HCF of (x – 1)(x² + 3x + a) and (x + 2)(x² + 2x + b) is x² + x – 2, values of a and b? - CDS Elementary Mathematics 2017 (II)

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If HCF of (x – 1)(x² + 3x + a) and (x + 2)(x² + 2x + b) is x² + x – 2, values of a and b?