Réponse :
a) = 4x + 9
b) = 4x^2/9 - 4x + 9
c) = 9t^2 - 49
d) = t^4 + 4t^2 + 4
Explications étape par étape
(a - b)^2 = a^2 - 2ab + b^2
(a + b)^2 = a^2 + 2ab + b^2
(a - b)(a + b) = a^2 - b^2
Bonjour
Developper et réduire :
(x + 3)^2 - x(x + 2)
= x^2 + 6x + 9 - x * x - x * 2
= x^2 + 6x + 9 - x^2 - 2x
= 4x + 9
(2x/3 - 3)^2
= 4x^2/9 - 4x + 9
(3t - 7)(3t + 7)
= (3t)^2 - 7^2
= 9t^2 - 49
(t^2 + 2)^2
= t^4 + 4t^2 + 4
