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A = (x + 5) ² F = (2x + 3) ²
B = (3x – 7) ² G = (7 – 3x) ²
C = (x + 4) (x – 4) H = (7x + 1) (7x – 1)
D = (x – 0,1) ² I = (5x + 6) (5x – 6)
E = (9b + 7) ² J = (10 – 11c) ²
A = (x + 5) ² F = (2x + 3) ²
B = (3x – 7) ² G = (7 – 3x) ²
C = (x + 4) (x – 4) H = (7x + 1) (7x – 1)
D = (x – 0,1) ² I = (5x + 6) (5x – 6)
E = (9b + 7) ² J = (10 – 11c) ²
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(a + b)² = a² + 2 ab + b²
A = x² + 10 x + 25
idem F et E
(a - b)² = a² - 2 ab + b²
( 3 x - 7 )² = 9 x² - 42 x + 49
idem G , D et J
( a + b ) ( a - b ) = a² - b²
( x + 4 ) ( x - 4 ) = x² - 16
idem H , I