Sagot :
Réponse :
bonjour
A = 3(x + 8) + 4(7x + 2)
= 3 x + 24 + 28 x + 8
= 31 x + 32
B = 5(x - 1) - 7x(2 + 3x)
= 5 x - 5 - 14 x - 21 x²
= - 21 x² - 9 x - 5
C = 2x(4 – 5x) - (x - 7)
= 8 x - 10 x² - x + 7
= - 10 x² + 7 x + 7
D = (3-8x) - 5(4x - 7)
= 3 - 8 x - 20 x + 35
= - 28 x + 38
E = 7(3-2x) - 4x(2x - 1)
= 21 - 14 x - 8 x² + 4 x
= - 8 x² - 10 x + 21
F = 7x-5(2-9x)+7(9x - 1)
=7 x - 10 + 45 x + 63 x - 7
= 115 x - 17
Explications étape par étape :
Bonjour !
[tex]A = 3(x + 8) + 4(7x + 2) \\ = 3x + 24 + 28x + 8 \\ = 31x + 32[/tex]
[tex]B = 5(x - 1) - 7x(2 + 3x) \\ = 5x - 5 - 14x - 21 {x}^{2} \\ = - 21 {x}^{2} - 9x - 5[/tex]
[tex]C = 2x(4 – 5x) - (x - 7) \\ = 8x - 10 {x}^{2} - x + 7 \\ = - 10 {x}^{2} + 7x + 7[/tex]
[tex]D = (3-8x) - 5(4x - 7) \\ 3 - 8x - 20x + 35 \\ = - 28x + 38[/tex]
[tex]E = 7(3-2x) - 4x(2x - 1) \\ = 21 - 14x - 8x + 7 \\ = - 22x + 28[/tex]
[tex]F = 7x-5(2-9x)+7(9x - 1) \\ = 7x - 10 + 45x + 63x - 7 \\ = 115x - 17[/tex]
Bonne soirée