Toán Lớp 8: Thực hiện phép tính
(x-1) (x+6)
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Toán Lớp 8: Thực hiện phép tính
(x-1) (x+6)
Comments ( 1 )
<=>x(x + 6) – 1(x + 6)
<=>x^{2} + 6x – 1(x + 6)
<=>x^{2} + 6x – (x + 6)
<=>x^{2} + 6x – x – 6
<=>x^{2} + 5x – 6
Vậy (x – 1)(x + 6) = x^{2} + 5x – 6