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Linda99
@Linda99
April 2019
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C urgent j'arrive pas a faire ses equations
a) 3(2x+7)-4=7-5(4-3x)
b) 2x(3x-4)+5=3x(2x-5)-4
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winner123
Verified answer
Bonsoir
a= 6 x + 21 - 4 = 7 - 20 + 15 x
a = 6 x - 15 x = 7 - 20 - 21 +4
a = - 9 x = - 30
x = 30/9 = 10 /3
b = 6 x² - 8 x + 5 = 6 x² - 15 x -4
6 x² - 6 x² - 8x + 15 x = - 4 - 5
7 x = - 9
x = - 9/7
1 votes
Thanks 1
Linda99
merci...
Linda99
et pour celui ci : 3-(2x-4)=x+7
maudmarine
3 - (2x - 4) = x + 7 ; 3 - 2x - 4 = x + 7 ; - 2x - x = 7 - 3 + 4 ; - 3x = 8 ; x = - 8/3
nonotata
a) 3(2x+7)-4=7-5(4-3x)
6x+21-4 = 7-20+15x
6x -15x = -13-17
-9x = -30
x = -30/-9
x = 10/3
b) 2x(3x-4)+5=3x(2x-5)-4
6x²-8x +5 = 6x² -15x-4
6x²-8x -6x²+15x = -4-5
7x = -9
x = -9/7
0 votes
Thanks 1
Linda99
merci
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Verified answer
Bonsoira= 6 x + 21 - 4 = 7 - 20 + 15 x
a = 6 x - 15 x = 7 - 20 - 21 +4
a = - 9 x = - 30
x = 30/9 = 10 /3
b = 6 x² - 8 x + 5 = 6 x² - 15 x -4
6 x² - 6 x² - 8x + 15 x = - 4 - 5
7 x = - 9
x = - 9/7
6x+21-4 = 7-20+15x
6x -15x = -13-17
-9x = -30
x = -30/-9
x = 10/3
b) 2x(3x-4)+5=3x(2x-5)-4
6x²-8x +5 = 6x² -15x-4
6x²-8x -6x²+15x = -4-5
7x = -9
x = -9/7