Bonjour !!!
f(x) = 5x + 3
1) f(-2) = 5*-2 + 3 = -10 + 3 = -7
2) f(x) = 23
5x + 3 = 23
5x = 23 - 3
5x = 20
x = 20/5
x = 4
3) 5x + 3 = 12
5x = 12 - 3
5x = 9
x = 9/5
x = 1,8
4)
f(5) = 5*5 + 3 = 25 + 3 = 28
f(-4) = 5*-4 + 3 = -20 + 3 = -17
Réponse:
1. f(-2)= 5×(-2)+3= -10+3= -7
2. f(x)= 23 --> 5x+3= 23
5x= 23-3
5x= 20
x= 20/5
x=4
3. f(x)= 12 --> 5x+3=12
5x=12-3
5x=9
x= 9/5 =1,8
4. f(5)= 5×5+3= 25+3= 28
f(-4)= 5×(-4)+3= -20+3= -17
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Bonjour !!!
f(x) = 5x + 3
1) f(-2) = 5*-2 + 3 = -10 + 3 = -7
2) f(x) = 23
5x + 3 = 23
5x = 23 - 3
5x = 20
x = 20/5
x = 4
3) 5x + 3 = 12
5x = 12 - 3
5x = 9
x = 9/5
x = 1,8
4)
f(5) = 5*5 + 3 = 25 + 3 = 28
f(-4) = 5*-4 + 3 = -20 + 3 = -17
Réponse:
1. f(-2)= 5×(-2)+3= -10+3= -7
2. f(x)= 23 --> 5x+3= 23
5x= 23-3
5x= 20
x= 20/5
x=4
3. f(x)= 12 --> 5x+3=12
5x=12-3
5x=9
x= 9/5 =1,8
4. f(5)= 5×5+3= 25+3= 28
f(-4)= 5×(-4)+3= -20+3= -17