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Bjr
Développer puis réduire :
A = 2x(x + 3)
A = 2x² + 6x
B = –7y²(–5 – 2y²)
B = 35y² + 14y⁴
C = (x + 5)(x + 1)
C = x² + x + 5x + 5
C = x² + 6x + 5
D = (2x – 5) (x + 4)
D = 2x² + 8x – 5x – 20
D= 2x² + 3x – 20
E = (4 – a)²
E = 4² – 2 × 4 × a + a²
E = 16 – 8a + a²
F = (2x + 3)²
F = (2x)² + 2 × 2x × 3 + 3²
F = 4x² + 12x + 9
G = (4 – 7x)(4 + 7x)
G = 4² – (7x)²
G = 16 – 49x²
H = (x + 4)(x – 6) + (–1 + x)(x – 7)
H = (x² – 6x + 4x – 24) + (–x + 7 + x² – 7x)
H = (x² – 2x – 24) + (x² – 8x + 7)
H = x² – 2x – 24 + x² – 8x + 7
H = 2x² – 10x – 17
I = –3(a² + 2) – (a – 3)(2a + 7)
I = (–3a² – 6) – (2a² + 7a – 6a – 21)
I = (–3a² – 6) – (2a² + a – 21)
I = –3a² – 6 – 2a² – a + 21
I = –5a² – a + 15
J = 4 – (2x + 1)²
J = 4 – [(2x)² + 2 × 2x × 1 + 1²]
J = 4 – (4x² + 4x + 1)
J = 4 – 4x² – 4x – 1
J = 3 – 4x² – 4x
Bonne Année !
Réponse :
Bonjour et Bonne année !
Explications étape par étape :
Développement
A = 2x (x + 3)
A = 2x² + 6x
B = –7y²(–5 – 2y²)
B = + 35 y² + 14 y⁴
C = (x + 5)(x + 1)
C = x² + x + 5x + 5
C = x² +6x + 5
D = (2x – 5) (x + 4)
D = 2x² + 8x - 5x - 20
D = 2x² + 3x - 20
E = (4 – a)²
E = 16 -8a + a²
F = (2x + 3)²
F = 4x² + 12x + 9
G = (4 – 7x)(4 + 7x)
G = 16 + 28x - 28x - 49x²
G = - 49x² + 16
H = (x + 4)(x – 6) + (–1 + x)(x – 7)
H = x² - 6x + 4x -24 + (-x +7 + x² -7x)
H = x² -2x -24 -8x +7 + x²
H = +2x² -10x -17
I = –3(a² + 2) – (a – 3)(2a + 7)
I = -3a² -6 - ( 2a² + 7a -6a -21)
I = -3a² -6 - ( 2a² +a -21)
I = -3a² -6 -2a² -a + 21
I = -5a² +15 -a
J = 4 – (2x + 1)²
J = 4 - ( 4x² + 4x + 1)
J = 4 - 4x² -4x -1
J = - 4x² -4x +3
