Question

Alguien que me ayude ​

Answer 1

Respuesta:

a.

${x}^{2} - 5 = 11 \\ {x}^{2} = 11 + 5 \\ {x }^{2} = 16 \\ \sqrt{ {x}^{2} } = \sqrt{16} \\ x = 4$

b.

$3 {x}^{2} - 7 = 20 \\ 3 {x}^{2} = 20 + 7 \\ 3 {x }^{2} = 27 \\ {x}^{2} = \frac{27}{3} \\ {x}^{2} = 9 \\ \sqrt{ {x}^{2} } = \sqrt{9} \\ x = 3$

c.

${x}^{2} - 100 = 0 \\ {x}^{2} = 100 \\ \sqrt{ {x}^{2} } = \sqrt{100} \\ x = 10$

d.

$2 {x}^{2} - 98 = 0 \\ 2 {x}^{2} = 98 \\ {x}^{2} = \frac{98}{2} \\ {x}^{2} = 49 \\ \sqrt{ {x}^{2} } = \sqrt{49} \\ x = 7$

e.

${x}^{2} + 9 = 130 \\ {x}^{2} = 130 - 9 \\ {x}^{2} = 121 \\ \sqrt{ {x}^{2} } = \sqrt{121} \\ x = 11$