$x^2 - 144 = 0$
(x − 12)(x + 12) = 0
x − 12 = 0
x = 12
или
x + 12 = 0
x = −12
Ответ: −12 и 12

$100 - 81x^2 = 0$
(10 − 9x)(10 + 9x) = 0
10 − 9x = 0
−9x = −10
$x = \frac{10}{9} = 1\frac{1}{9}$
или
10 + 9x = 0
9x = −10
$x = -\frac{10}{9} = -1\frac{1}{9}$
Ответ: $-1\frac{1}{9}$ и $1\frac{1}{9}$

$196 - y^2 = 0$
(14 − y)(14 + y) = 0
14 − y = 0
y = 14
или
14 + y = 0
y = −14
Ответ: −14 и 14

$225y^2 - 64 = 0$
(15y − 8)(15y + 8) = 0
15y − 8 = 0
15y = 8
$y = \frac{8}{15}$
или
15y + 8 = 0
15y = −8
$y = -\frac{8}{15}$
Ответ: $-\frac{8}{15}$ и $\frac{8}{15}$