Bonjour,
Factoriser :
A = [tex]7x^{2} - 28[/tex]
A = [tex]7(x^{2} - 4)[/tex]
A = 7(a^2 - b^2) = 7(a + b)(a - b)
A = [tex]7(x - 2)(x + 2)[/tex]
B = [tex]\dfrac{4}{9}x^{2} - \dfrac{49}{81}[/tex]
B = a^2 - b^2
B = [tex](\dfrac{4}{9}x - \dfrac{7}{9})(\dfrac{4}{9}x + \dfrac{7}{9})[/tex]
B = [tex]\dfrac{1}{81}(4x - 7)(4x + 7)[/tex]
C = [tex]18x^{2} - 48x + 32[/tex]
C = [tex]2(9x^{2} - 24x + 16)[/tex]
C = [tex]2[(3x)^{2} - 2 \times 3x \times 4 + 4^{2}][/tex]
C = 2(a^2 - 2ab + b^2) = 2(a - b)^2
C = [tex]2(3x - 4)^{2}[/tex]
D = [tex]\sqrt3x^{2} + 2\sqrt3x + \sqrt3[/tex]
D = [tex]\sqrt3(x^{2} + 2x + 1)[/tex]
D = [tex]\sqrt3(x + 1)^{2}[/tex]
E = [tex]5(3x - 2) - \dfrac{5}{6}(3x - 2)[/tex]
E = [tex](3x - 2)(5 - \dfrac{5}{6}[/tex]
E = [tex](3x - 2)(\dfrac{30-5}{6}[/tex]
E = [tex](3x - 2)(\dfrac{25}{6})[/tex]
