Question

preciso pra ontem!!!

Answer 1

$2 {x}^{2} + 4 = 54 \\ 2{x}^{2} = 54 - 4 \\ 2 {x}^{2} = 50 \\ {x}^{2} = 25 \\ x = 5 \: ou \: x = - 5 \\ \\ 2y - 6 = 8 \\ 2y = 8 + 6 \\ 2y = 14 \\ y = 7$