bonjour
a = 14 x
b = - 20 x
c = 3 x²
d = 30 x²
e = 18 x²
f = 38 x
g = - 5 x
h = - 10 x
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A = - 5 ( 2 x - 1 )
= - 5 * 2 x - 5 * - 1
= - 10 x + 5
B = x ( x + 3 ) + 2 ( x - 7 ) = tu distribues le chiffre devant la parenthèse
B = x² + 3 x + 2 x - 7 x
B = x² - 2 x
C = ( 4 x - 3 ) ( 2 + 9 x )
C = 8 x + 36 x² - 6 - 27 x
c = 36 x² - 19 x - 6
D = ( 3 x - 1 )² = 9 x² - 6 x + 1
E = 35 x² - 30 x + 28 x - 24 + 4 x² + 12 x +9
E = 39 x² + 10 x - 15
F = 5 x + 5 y = 5 ( x + y )
G = x ( 3 x - 7 )
H = 2 ( x + 6 )
I = a ( b - 1 )
J = 5 ( 3 a + b - 4 )
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K = ( x + 3 ) ( 2 x + 1 + 5 x - 7 )
K = ( x +3 ) ( 7 x - 6 )
L = tu factorises 3 x - 4
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M = 9 - x² = ( 3 - x ) ( 3 + x )
continue , c'est la leçon sur les identités remarquables donc apprends la
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7 x - 2 = 5
7 x = 5 + 2
7 x = 7
x = 1
5 x + 4 = 0
5 x = - 4
x = - 4/5
- 2 x - 1 = - 6
- 2 x = - 6 + 1
- 2 x = - 5
x = 5 /2