Question

mim ajuda por favor​

Answer 1

Resposta:

$a) \\ 4 {x}^{2} - 27 = {x}^{2} \\ 4 {x}^{2} - {x}^{2} = 27 \\ 3 {x}^{2} = 27 \\ {x}^{2} = \frac{27}{3} \\ {x}^{2} = 9 \\ x = \sqrt{9} \\ x = 3 \\ \\ b) \\ 8 {x}^{2} = 60 - 7 {x}^{2} \\ 8 {x}^{2} + 7 {x}^{2} = 60 \\ 15 {x}^{2} = 60 \\ {x}^{2} = \frac{60}{15} \\ {x}^{2} = 4 \\ x = \sqrt{4} \\ x = 2 \\ \\ c) \\ 3( {x}^{2} - 1) = 24 \\ 3 {x}^{2} - 3 = 24 \\ 3 {x}^{2} = 24 + 3 \\ 3 {x}^{2} = 27 \\ {x}^{2} = \frac{27}{3} \\ {x}^{2} = 9 \\ x = \sqrt{9} \\ x = 3$