Question

5 x al cuadrado menos 4 = 16​

Answer 1

${5x}^{2} - 4 = 16 \\ {5x}^{2} = 16 + 4 \\ {5x}^{2} = 20 \\ {x}^{2} = 20 \div 5 \\ {x}^{2} = 4 \\ x = \sqrt{4} \\ x = 2$