Вправи: 520 (1-2)

520. Розв’яжіть рівняння:

1) 16 – (2 – 3x)² = 0;

(4 + 2 – 3х)(4 – 2 + 3х) = 0;

(6 – 3х)(2 + 3х) = 0;

6 – 3х = 0;

3х = 6;

х = 2;

2 + 3х = 0;

3х = –2;

х = –23.

2) (5 + 2х)² – х² = 0;

(5 + 2х + х)(5 + 2х – х) = 0;

(3х + 5)(х + 5) = 0;

3х + 5 = 0;

х = –123;

х + 5 = 0;

х = –5.

3) (8 + 5х)² – (4х – 1)² = 0;

(8 + 5х + 4х – 1)(8 + 5х – 4х + 1) = 0;

(9х + 7)(х + 9) = 0;

9х + 7 = 0;

9х = –7;

х = –79;

х + 9 = 0;

х = –9.