Respostas

2014-06-25T14:14:45-03:00
(3x-5)2-(2x+4)=0⇔ 6x-10-4x-8=0⇔6x-4x=10+8⇔2x=18⇔x=18÷2⇔x=9
2014-06-25T14:28:11-03:00

(3x-5)2-(2x+4)2= 0

6x – 10 –(4x + 8) =0

6x – 10 – 4x – 8 = 0

6x – 4x = +10 + 8

2x = 18

X = 18/2

X = 9

só acrescenta = 0 na conta acima....