Question

Хв во 2 степени -9=0 уравнение 2) у во 2 -4=0 ,3) 121-х во 2 =0 4)1,96-у во 2 =0

Answer 1

1) $x^{2}-9=0$

$x^{2}=9$

$x_{1}=\sqrt{9}=3$

$x_{2}=-\sqrt{9}=-3$

2) $y^{2}-4=0$

$y^{2}=4$

$y_{1}=\sqrt{4}=2$

$y_{2}=-\sqrt{4}=-2$

3) $121-x^{2}=0$

$x^{2}=121$

$x_{1}=\sqrt{121}=11$

$x_{2}=-\sqrt{121}=-11$

4) $1,96-y^{2}=0$

$y^{2}=1,96$

$y_{1}=\sqrt{1,96}=1,4$

$y_{2}=-\sqrt{1,96}=-1,4$

Answer 2

1) (x-3)(x+3)=0 otvet 3;-3

2) (y-2)(y+2)=0 y1=2 y2=-2

3) (11-x)(11+x)=0 otvet 11 and -11

(1,4-y)(1,4+y)=0 otvet 1,4 and -1,4