Toán Lớp 8: Rút gọn
b)(x² + x – 10 )(x – 2)
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Toán Lớp 8: Rút gọn
b)(x² + x – 10 )(x – 2)
Comments ( 2 )
= x². x + x² . (-2) + x . x + x . (-2) + ( -10 ) . x + ( -10 ) . ( -2 )
= x³ – 2x² + x² – 2x – 10x + 20
= x³ – x² – 12x + 20