Question

1)c²-0,25=0
2)81x²-121=0
3)--0,09+4x²=0

пример:
1)a²-4=a²-2²=(a-2)(a+2)​

Answer 1

1)

${c }^{2} = 0 + 0.25$

$c = \sqrt{0.25}$

$c = 0.5$

2)

$81 {x}^{2} = 0 + 121$

${x}^{2} = 121 \div 81$

$x = \sqrt{121 \div 81}$

$x = \frac{11}{9}$

$4 {x}^{2} = 0 + 0.09$

${x}^{2} = 0.09 \div 4$

$x = \sqrt{0.09 \div 4}$

$x = 0.3 \div 2$

$x = 1.5$

Answer 2

1)c²-0,25= с²-0,5²=(с-0,5)(с+0,5)

2)81x²-121= 9²х²-11² = (9х-11)(9х+11)

3)--0,09+4x² = 4х²-0,09 = 2²х²-0,3² = (2х-0,3)(2х+0,3)