Question

Suassuna,Simpson ajudem aii​

Answer 1

Olá!

a)

${ x}^{2} - 49= 0$

${x}^{2} = 49$

$x = \sqrt{49}$

$x = + - 7$

b)

$2 {x}^{2} - 50 = 0$

$2 {x}^{2} = 50$

${x}^{2} = 50 \div 2$

${x}^{2} = 25$

$x = \sqrt{25}$

$x = + - 5$

c)

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

$7 {x}^{2} = 7$

${x}^{2} = 7 \div 7$

${x}^{2} = 1$

$x = \sqrt{1}$

$x = + - 1$

d)

$5 {x}^{2} - 15 = 0$

$5 {x}^{2} = 15$

${x}^{2} = 15 \div 3$

${x}^{2} = 5$

$x = \sqrt{5}$

e)

$5 {x}^{2} + 20 = 0$

$5 {x}^{2} = - 20$

${x}^{2} = - 20 \div 5$

${x}^{2} = - 4$

$x = \sqrt{ - 4}$

$x = + - 2i$

:)