Sagot :
Bonjour,
Image de -4 : f(-4) = 2 × (-4) - 7 = -8 - 7 = -15
antécédents de -13 :
2x - 7 = - 13
2x = - 13 + 7
2x = - 6
x = - 6/2
x = - 3
f(-9) = 2 × (-9) - 7 = -18 - 7 = -25
Image de 3 :
g(3) = 2 × 3 - 7 = 6 - 7 = - 1
g(x) = 1
2x - 7 = 1
2x = 1 + 7
2x = 8
x = 8/2 = 4
1) g(-4)=2*(-4)-7=-8-7=-15
2) g(x)= -13
2x-7= -13
2x=7-13
2x= -6
x= -6/2
x= -3
3) 2x-7=-9
2x = -2
x= -1
4) g(3)= 2*3-7=-1
5) g(x)=1
2x-7=1
2x= 8
x= 8/2
x= 4
Voilà :) n’hésite pas si tu as des questions !
2) g(x)= -13
2x-7= -13
2x=7-13
2x= -6
x= -6/2
x= -3
3) 2x-7=-9
2x = -2
x= -1
4) g(3)= 2*3-7=-1
5) g(x)=1
2x-7=1
2x= 8
x= 8/2
x= 4
Voilà :) n’hésite pas si tu as des questions !