Factoriser si c'est possible (pas obligé de développer) :
B = y² - 24y + 144
A = 81 - 18b + b²
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Faites-nous connaître une identité algébrique:
(a - b)² = a² - 2ab + b²
Les réponses sont données ci-dessous:
B = y² - 24y + 144
= y² - 2 * y * 12 + 12²
= (y - 12)²
= (y - 12) (y - 12)
C'est la factorisation requise.
A = 81 - 18b + b²
= 9² - 2 * 9 * b + b²
= (9 - b)²
= (9 - b) (9 - b)
C'est la factorisation requise.
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