Question

(2x-5).(2x+5) - (2x-5) elevado a 2 =0

Answer 1

(2x-5).(2x+5) - (2x-5) elevado a 2 =0

(2x-5).(2x+5) - (2x-5)^2= 0

4x^2 - 25 - (2x-5)^2 = 0

4x^2 - 25 - (4x^2 - 2.5.2x + 25)=0

4x^2 - 25 - (4x^2 - 20x+ 25) = 0

4x^2 - 25 - 4x^2 + 20x - 25= 0

20.x - 50= 0

20x = 50

2x = 5

x =5/2