3x ( x – 2 ) – 5x (1 – x) – 8 ( x2 – 3 )

0 bình luận về “3x ( x – 2 ) – 5x (1 – x) – 8 ( x2 – 3 )”

1. `3x . ( x – 2 ) – 5x . ( 1 – x ) – 8 . ( x^2 – 3 )`

   `⇒ (3x)^2 – 6x – 5x . (- x + 1 ) – 8 . ( x^2 – 3 )`

   `⇒ (3x)^2 – 6x + (5x)^2 – 5x  – (8x)^2 + 24 `

   `⇒ -(6x) – 5x + 24`

   `⇒ -11x + 24`

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2. `3x(x – 2) – 5x(1 – x) – 8(x^2 – 3)`

   `= 3x. x – 3x. 2 – 5x + 5x. x – 8. x^2 + 8. 3`

   `= 3x^2 – 6x – 5x + 5x^2 – 8x^2 + 24`

   `= (3x^2 + 5x^2 – 8x^2) – (6x + 5x) + 24`

   `= -11x + 24`

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