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Sagot :

Bonjour,

A = (3a + 1)² - 16

a) Développer :

A = (3a + 1)² - 16

A = 9a² + 6a + 1 - 16

A = 9a² + 6a - 15

b) Factoriser :

A = (3a + 1)² - 16

A = (3a + 1 - 4) (3a + 1 + 4)

A = (3a - 3) (3a + 5)

A = 3 (a - 3) (3a + 5)

c) Résoudre A = 0

A = (3a + 1)² - 16

A = (3 * 0 + 1)² - 16

A = 1² - 16

A = 1 - 16

A = - 15

Résoudre A = - 15

A = (3a + 1)² - 16

A = (3 * - 15 + 1)² - 16

A = (- 45 + 1)² - 16

A = (- 44)² - 16

A = 1 936 - 16

A = 1 920.

Résoudre A = - 16

A = (3a + 1)² - 16

A = (3 * - 16 + 1)² - 16

A = (- 48 + 1)² - 16

A = (- 47)² - 16

A = 2 209 - 16

A = 2 193

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