Réponse :

Par exemple A=(3x+5)**2

Explications étape par étape

A=9x**2+30x+

= (3x)**2+2x5x3x+5**2

= (3x+5)**2

**2 = au carré

Réponse :

A = 9x² + 30x + 25

A = (3x)² + 2 X 3 X 5x + 5²

A = (3x + 5)²

B= x² + 10x + 25

B = x² + 2 X 5x + 5²

B = (x + 5)²

C = 4t² + 24t + 36

C = (2t)² + 2 X 6 X 2t + 6²

C = (2t + 6)²

D = 9x² + 64 + 48x

D = (3x)² + 8² + 2 X 3 X 8x

D = (3x + 8)²

E = 9 + 4x² - 12x

E = 3² + (2x)² - 2 X 3 X 2x

E = (2x - 3)²

F= x² - 2x + 1

F = x² - 2 X 1x + 1²

F = (x - 1)²

G = y² - 18y + 81

G = y² - 2 X 9y + 9²

G = (y - 9)²

H = 16 x² + 25 - 40x

H = - 40x + 25

H = - 2 X 4x X 5 +

H = ( 4 x - 5 )²

I =   x² - 49  

I =   -

I = (x-7) (x+7)

J = 81 - t²

J = -

J = (9-t) (9+t)

K = 16x²- 36

K =   -

K = (4x-6) (4x+6)