Question

2 Resolva As Equações Do 1 Grau a) 5x+3=9x+5 b) 7+×-2x+5=9+7x-4 c) 8+3(3x+5)=7-x7(2+x) Me Ajudem Por Favor

Answer 1

a) 4x+3=9x+5
+3-5=9x-4x
-2=9x-4x
-2=5x
-2/5=x
b)7+x-2x+5=9+7x-4
7+5-9+4=7x+2x-x
7=7x
x=7/7
x=1
c) 8+3(3x+5)=7-x.7(2+x)
 8+9x+15=7-x.(14.7x)
23+9x=7-x(14.7x)
9x+23=7-14x-7x²
9x+23-7+14x+7x²=0
7x²+23x+16=0
23²-4.7.16
529 - 448 = 0
delta = raiz de 81
x`= -23+9/2.7
-14/14
x`= -1
x``=-23-9/2.7
32/14
x``= 16/7