Sagot :
14x+17=-25
14x = -42 ; x= -42/14 = -3 , donc -3 est solution
3/2x-5 = -1/2x-3
3/2x+1/2x = -3+5
4/2x = 2
2x=2 donc x=1
2x² -3 = -5x
2x²+5x = 3
2(1)²+5(1) = 2+5 = 7, 1 nest pas solution
2(-3)²+5(-3) =18-15 = 3 , -3 est solution
14x + 17= -25
14x= -25-17
14x= -42
x=-42/14
x=-3
3/2x -5= -1/2x -3
3/2x= -1/2x -3+5
3/2x= -1/2x +2
3/2x+1/2x = 2
4/2x = 2
2x= 2
x = 2/2
x=1