Verified answer

Bonsoir,

1)

A = 3 (4x + 7) + 4 (2x - 9)

A = 12x + 21 + 8x - 36

A = 12x + 8x + 21 - 36

A = 20x - 15

B = 7x (2x - 5) - x (2x - 5)

B = 14x² - 35x - 2x² + 5x

B = 14x² - 2x² - 35x + 5x

B = 12x² - 30x

C = (2x + 5) (3x + 7)

C = 6x² + 14x + 15x + 35

C = 6x² + 29x + 35

D = (2x - 5) (3x - 2)

D = 6x² - 4x - 15x + 10

D = 6x² - 19x + 10

2)

E = (2x + 3) (5x - 8) - (2x - 4) (5x - 1)

E = 10x² - 16x + 15x - 24 - (10x - 2x - 20x + 4)

E = 10x² - 16x + 15x - 24 - 10x + 2x + 20x - 4

E = 10x² - 16x - 10x + 15x + 2x + 20x - 24 - 4

E = 10x² + 11x - 28

F = (5x - 2) (5x - 8) - (3x - 5) (x + 7)

F = 25x² - 40x - 10x + 16 - (3x² + 21x - 5x - 35)

F = 25x² - 40x - 10x + 16 - 3x² - 21x + 5x + 35

F = 25x² - 3x² - 40x - 10x - 21x + 5x + 16 + 35

F = 22x² - 56x + 51

G = 2 (x + 7) (3 - 2x) + (5x - 2) (4x + 1)

G = 2 (3x - 2x² + 21 - 14x) + 20x² + 5x - 8x - 2

G = 6x - 4x² + 42  - 28x + 20x² + 5x - 8x - 2

G = - 4x² + 20x² + 6x + 5x - 28x - 8x + 42 - 2

G = + 16x² - 25x + 40

3)

H = (x + 5)²

H = x² + 10x + 25

I = (4x + 6)²

I = 24x² + 48x + 36

J = (x - 5)²

J = x² - 10x + 25

K = (3x - 7)²

K = 9x² - 42x + 49

L = (y + 3) (y - 3)

L = y² - 9

M = (2x + 5) (2x - 5)

M = 4x² - 25