Réponse :
Bonjour
Explications étape par étape :
-5x (-2x + 3)
(-5x × - 2x) + (- 5x × 3)
10x² + ( - 15x)
+10x² - 15x
(7x + 2) (5x - 4)
(7x × 5x) + (7x × - 4) + (2 × 5x) + (2 × - 4)
35x² + ( - 28x ) + 10x + (-8)
35² - 28x + 10x - 8
35x² - 18x - 8
(2x + 7)(3x - 1) (-2x + 1)
((2x × 3x) + (2x × (-1)) + (7 × 3x) + (7 × - 1)) × (-2x + 1)
( 6x² + ( -2x) + 21x + ( -7) ) × (-2x + 1)
( 6x² - 2x + 21x - 7) × (-2x + 1)
(6x² + 19x - 7) × (-2x + 1)
6x² × (−2x) + 6x² × 1 + 19x × (−2x) + 19x × 1 + (−7 ) × (−2x) + (−7) × 1
-12x³ + 6x² + (-38x²) + 19x + 14x - 7
-12x³ + 6x² - 38x² + 33x - 7
- 12x³ - 32x² + 33x - 7
(2x + 5)²
(2x)² + 2 × 2x × 5 + 5²
4x² + 20x + 25
(3x - 2)²
(3x)² + 2 × 3x × (-2) + (-2)²
9x² + (-12x) + 4
9x² - 12x + 4
f)
(7x + 3)(7x - 3)
(7x)²+ 7x × (-3) + 3 x 7x + 3 × - 3
49x ² - 21x + 21x - 9
49x² - 9
a)
(3x - 5) (-2x + 3) + (4x + 2)(3x - 1)
3x × (-2x) + 3x × 3 + (-5) × (-2x) + (-5) × 3 + (4x + 2)(3x - 1)
-6x² + 9x + 10x - 15 + 4x × 3x + 4x × (-1) + 2 × 3x + 2 × (-1)
-6x² + 19x - 15 + 12x² - 4x + 6x - 2
6x² + 21x - 17
b)
(8x - 3)(2x -5) - (4x + 1) (3x - 7)
8x × (2x) + 8x × (-5) + (-3) × (2x) + (-3) ×(-5) - (4x + 1) (3x - 7)
16x² - 40x - 6x + 15 - ( 4x × 3x + 4x × (-7) + 3x - 7)
16x² - 46x + 15 - ( 12x² - 28x + 3x - 7)
16x² - 46x + 15 - 12x² + 28x - 3x + 7
4x² -21x + 22
d)
(2x - 3)² + (3x + 5)²
4x² - 12x + 9 + 9x² + 30x + 25
13x² + 18x + 34
voilà
Bonne journée
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Verified answer
Réponse :
Bonjour
Explications étape par étape :
Partie A
a)
-5x (-2x + 3)
(-5x × - 2x) + (- 5x × 3)
10x² + ( - 15x)
+10x² - 15x
b)
(7x + 2) (5x - 4)
(7x × 5x) + (7x × - 4) + (2 × 5x) + (2 × - 4)
35x² + ( - 28x ) + 10x + (-8)
35² - 28x + 10x - 8
35x² - 18x - 8
c)
(2x + 7)(3x - 1) (-2x + 1)
((2x × 3x) + (2x × (-1)) + (7 × 3x) + (7 × - 1)) × (-2x + 1)
( 6x² + ( -2x) + 21x + ( -7) ) × (-2x + 1)
( 6x² - 2x + 21x - 7) × (-2x + 1)
(6x² + 19x - 7) × (-2x + 1)
6x² × (−2x) + 6x² × 1 + 19x × (−2x) + 19x × 1 + (−7 ) × (−2x) + (−7) × 1
-12x³ + 6x² + (-38x²) + 19x + 14x - 7
-12x³ + 6x² - 38x² + 33x - 7
- 12x³ - 32x² + 33x - 7
d)
(2x + 5)²
(2x)² + 2 × 2x × 5 + 5²
4x² + 20x + 25
e)
(3x - 2)²
(3x)² + 2 × 3x × (-2) + (-2)²
9x² + (-12x) + 4
9x² - 12x + 4
f)
(7x + 3)(7x - 3)
(7x)²+ 7x × (-3) + 3 x 7x + 3 × - 3
49x ² - 21x + 21x - 9
49x² - 9
Partie B
a)
(3x - 5) (-2x + 3) + (4x + 2)(3x - 1)
3x × (-2x) + 3x × 3 + (-5) × (-2x) + (-5) × 3 + (4x + 2)(3x - 1)
-6x² + 9x + 10x - 15 + 4x × 3x + 4x × (-1) + 2 × 3x + 2 × (-1)
-6x² + 19x - 15 + 12x² - 4x + 6x - 2
6x² + 21x - 17
b)
(8x - 3)(2x -5) - (4x + 1) (3x - 7)
8x × (2x) + 8x × (-5) + (-3) × (2x) + (-3) ×(-5) - (4x + 1) (3x - 7)
16x² - 40x - 6x + 15 - ( 4x × 3x + 4x × (-7) + 3x - 7)
16x² - 46x + 15 - ( 12x² - 28x + 3x - 7)
16x² - 46x + 15 - 12x² + 28x - 3x + 7
4x² -21x + 22
d)
(2x - 3)² + (3x + 5)²
4x² - 12x + 9 + 9x² + 30x + 25
13x² + 18x + 34
voilà
Bonne journée