Bonjour
factoriser ces expressions :
A(x)= 9(x-1) au carré - 25
A(x) = 3^2(x - 1)^2 - 5^2
Du type : a^2 - b^2 = (a - b)(a + b)
A(x) = [3(x - 1) - 5][3(x - 1) + 5]
A(x) = (3x - 3 - 5)(3x - 3 + 5)
A(x) = (3x - 8)(3x + 2)
B(x)= 16-4(2x+3) au carré
B(x) = 4^2 - 2^2(2x + 3)^2
B(x) = [4 - 2(2x + 3)][4 + 2(2x + 3)]
B(x) = (4 - 4x - 6)(4 + 4x + 6)
B(x) = (-4x - 2)(4x + 10)
B(x) = -2(2x + 1) * 2(2x + 5)
B(x) = -4(2x + 1)(2x + 5)
