Bonjour
Factoriser :
(2x + 1)² - 9
= (2x + 1 - 3) (2x + 1 + 3)
= (2x - 2) (2x + 4)
= 2 (x - 1) (x + 2)
0,25 - (x - 1,5)²
= (- 0,5 + x - 1,5) (0,5 + x - 1,5)
= (x - 2) (x - 1).
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Bonjour
Factoriser :
(2x + 1)² - 9
= (2x + 1 - 3) (2x + 1 + 3)
= (2x - 2) (2x + 4)
= 2 (x - 1) (x + 2)
0,25 - (x - 1,5)²
= (- 0,5 + x - 1,5) (0,5 + x - 1,5)
= (x - 2) (x - 1).