Question

Determine as raízes reais das equações incompletas:

Answer 1

Resposta:

Boa noite!

Explicação passo-a-passo:

Seguem 4 exemplos de como você resolver equações incompletas:

$a) x^{2} -49=0\\\\x^{2} =49\\\\x=\sqrt{49} \\\\x=7\\\\\\b)x^{2} =1\\\\x=\sqrt{1} \\\\x=1\\\\\\c)2x^{2} =50\\\\x^{2} =\dfrac{50}{2} \\\\x=\sqrt{25} \\\\x=5\\\\\\d)7x^{2} =7\\\\x^{2}= \dfrac{7}{7} \\\\x=\sqrt{1} \\\\x=1$

Answer 2

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

${x}^{2} = 49\rightarrow x = 7$

_____________________________________

${x}^{2} = 1$

$x = 1$

______________________________________

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

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

${x}^{2} = 25$

$x = 5$

______________________________________

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

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

${x}^{2} = 1$

$x = 1$

______________________________________

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

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

${x}^{2} = 3$

$x= \sqrt{3}$

______________________________________

$7 {x}^{2} = 21$

${x}^{2} = 3$

$x = \sqrt{ 3}$

______________________________________

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

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

$x \notin \R$

______________________________________

$7 {x}^{2} + 2 = 30$

${7x}^{2} = 28$

${x}^{2} = 4$

$x = 2$

______________________________________

${2x}^{2} - 90 = 8$

${2x}^{2} = 98$

${x}^{2} = 49$

$x = 7$

______________________________________

${4x}^{2} - 27 = {x}^{2}$

$3 {x}^{2} = 27$

${x}^{2} = 9$

$x = 3$

______________________________________

$8 {x}^{2} = 60 - 7 {x}^{2}$

${15x}^{2} = 60$

${x}^{2} = 4$

$x = 2$