(-2x+1)(-2x-7)=0 Решить уравнение.

Question

(-2x+1)(-2x-7)=0
Решить уравнение.

Answer 1

(-2x+1)(-2x-7)=0
4x^2+14x-2x-7=0
4x^2+12x-7=0
D=144-4*(-7)*4=256=16^2
x1=(-12+16)/8=0.5
x2=(-12-16)/8=3.5

Comments

-3.5

Answer 2

1) - 2x + 1 = 0 
- 2x = - 1
2x = 1 
x = 1 /2 = 0,5

2) - 2x - 7 = 0 
- 2x = 7 
2x = - 7 
x = - 3,5