a2 -1
9
16
= 0
a2 -
25
16
= 0
( a -
5
4
)( a +
5
4
) = 0
a -
5
4
= 0; a +
5
4
= 0
a =
5
4
; a = -
5
4
Cavab:
5
4
; -
5
4
.
(a - 2b)2 - (2b + a)2
=
= ((a -2b) - (2b +a))
⋅
⋅ ((a - 2b)+(2b +a)) =
= (a -2b
- 2b - a) ⋅
⋅ (a-2b + 2b + a) =
= -4b ⋅ 2a = - 8ab.
(a - 8)(a + 12) = 0;
m2 - 0,25 = 0;
9x2 - 64 = 0;
b2 + 36 = 0;
4x2 - 9 = 0;
x2 - 16 = 0;
1
9
- y2 = 0;
x2 -
9
25
= 0;
81a2 + 1 = 0;
49
81
m2 - 1 = 0.
(a + b)2 - 22 = (a + b - 2)(a + b + 2)
(x + 3)2-42;
81 - (2x - 5)2;
49x2 - (2 + 3x)2;
(a + b)2 - (b - a)2;
(2x - 5)2 - (5 +2x)2;
(4a - 1)2 - 25;
9y2 - (1 + 7y)2;
(a + 11)2-121;
(m + n)2 - (m- n)2;
(4c - x)2 - (2c + 3x)2.
119;
851;
319;
1431;
817;
2419.