Question

A -25+x² ?
E 4x²=20=0​

Answer 1

Resposta:

a)

$- 25 + {x}^{2} = 0 \\ {x}^{2} = 25 \\ x = \sqrt{25} \\ x = 5 \: ou \: x = - 5$

e)

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