Bonjour
a.(3x + 1 )² = 9x² + 6x + 1
e.(4x - 3) ² = 16x² - 24x + 9
i.(2x + 1)(2x - 1) = 4x² - 1
b.(x/2 - 2)² = x²/4 - 4x/2 + 4 = x²/4 - 2x + 4
f.(-7 +5x) ² = 49 - 70x + 25x²
k.(3x + 1/2)(3x - 1/2) = 9x² - 1/4
c.(-2x + 0,5 )² = 4x² - 2x + 0,25
g.(-3x - 1/3) ²= 9x² + 6/3x + 1/9 = 9x² + 2x + 1/9
d.(-3/2 - x/3)² = 9/4 + 6/6x + x²/9 = x²/9 + x + 9/4
h.(x/3 + 5 )² = x²/9 + 10x/3 + 25.
