Question

1) x2 - 7 = 0; 3) 138 - 3x2 = 0; 1) x2 - 0,002809 = 0; 3) 2x2 - 48,096 = 0; 2) 2x2 - 34 = 0; 4) 0,3x2 - 5,4 = 0. 2) 3,286x2 = 0; 4) (x - 4)2 - 28,09 = 0.срочно помогите​

Answer 1

Объяснение:

     3.16

1) $x^{2}$ - 7 = 0

$x^{2}$ = 7

x = ±$\sqrt{7}$

3) 138 - 3$x^{2}$ = 0 | ÷3

46 - $x^{2}$ = 0

-$x^{2}$ = -46

$x^{2}$ = 46

x = ±$\sqrt{46}$

2) 2$x^{2}$ - 34 = 0 | ÷2

$x^{2}$ - 17 = 0

$x^{2}$ = 17

x = ±$\sqrt{17}$

4) 0,3$x^{2}$ - 5,4 = 0 | ÷0,3

$x^{2}$ - 18 = 0

$x^{2}$ = 18

x = ±3$\sqrt{2}$

    3.17

1) $x^{2}$ - 0,002809 = 0 | ×1.000.000

1000000$x^{2}$ - 2809 = 0

1000000$x^{2}$ = 2809

$x^{2}$ = $\frac{2809}{1000000}$

x = ±$\frac{53}{1000}$

x = ±0,053

3) 2$x^{2}$ - 48,096 = 0 | ×125

250$x^{2}$ - 6012 = 0

250$x^{2}$ = 6012

$x^{2}$ = $\frac{3006}{125}$

x = ±$\frac{3\sqrt{1670} }{25}$

x ≈ ±4,90388

2) 3,286$x^{2}$ = 0

$x^{2}$ = 0

x = 0

4) (x-4)² - 28,09 = 0

(x-4)² - $\frac{2809}{100}$ = 0 | ×100

100(x-4)² - 2809 = 0

(10x - 40 - 53) × (10x - 40 + 53) = 0

(10x - 93) × (10x + 13) = 0

10x - 93 = 0     10x + 13 = 0

x = $\frac{93}{10}$                x = -$\frac{13}{10}$

x = 9,3              x = -1,3