Решить уравнение: а) (x – 2)(x + 2) = 0; б) x2 – 16 = 0; в) x2 + 10x + 25=0.

Question

Решить уравнение:
а) (x – 2)(x + 2) = 0;
б) x2 – 16 = 0;
в) x2 + 10x + 25=0.

Answer 1

1) ( x - 2)(x + 2) = 0
x - 2 = 0
x = 2
x + 2 = 0
x = - 2

2) x^2 - 16 = 0
x^2 = 16
x = 4
x = - 4

3) x^2 + 10x+ 25 =0
( x + 5)^2 = 0
x+ 5 = 0
x = - 5

Answer 2

А) (x – 2)(x + 2) = 0;
     x-2=0;  x=2
x+2=0;  x = - 2

б) x^2 – 16 = 0;
   (x - 4)(x+4) = 0
     x-4=0;   x = 4
     x+4=0;   x=-4

в) x^2 + 10x + 25=0.
     (x + 5)^2 = 0
       x+5 = 0; x=-5