Réponse :
A = 5(a-2)(4a+3) - (a-3)(a+3)
= 5(4a²+3a-8a-6) - (a-3)(a+3)
= 5(4a²-5a-6) - (a²-3²)
= (20a²-25a-30) - (a²-9)
= 20a² - 25a - 30 - a² + 9
= 19a² - 25a - 21
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Verified answer
Réponse :
A = 5(a-2)(4a+3) - (a-3)(a+3)
= 5(4a²+3a-8a-6) - (a-3)(a+3)
= 5(4a²-5a-6) - (a²-3²)
= (20a²-25a-30) - (a²-9)
= 20a² - 25a - 30 - a² + 9
= 19a² - 25a - 21