Question

me.pueden ayudar gracias​

Answer 1

Explicación paso a paso:

$2{x}^{2} + 28 = 10 \\ 2 {x}^{2} = 100 - 28 \\ 2 {x }^{2} = 72 \\ {x}^{2} = \frac{72}{2} \\ {x}^{2} = 36 \\ x = + o - \sqrt{36} \\ x = + o - 6$

$2 {x}^{2} - 15 = 35 \\ 2 {x}^{2} = 35 + 15 \\ 2 {x}^{2} = 50 \\ {x}^{2} = \frac{50}{2} \\ {x}^{2} = 25 \\ x = + o - \sqrt{25} \\ x = + o - 5$

$5 {x}^{2} - 20 = 300 \\ 5 {x}^{2} = 300 + 20 \\ 5 {x}^{2} = 320 \\ {x}^{2} = \frac{320}{5} \\ {x}^{2} = 64 \\ x = + o - \sqrt{64 } \\ x = + o - 8$