Question

resolva a equaçao incompleta do 2 grau$5x^{2} -3125=0$
A)X=20 E X=-20
B)X=25 E X=-25
C)X=30 E X=-30
D)X=-25 EX=-25
E)X=-35E X=25

Answer 1

Resposta:

$S=\{-25,\,25\}$

Explicação passo-a-passo:

$5 {x}^{2} - 3125 = 0 \\ 5 {x}^{2} = 3125 \\ {x}^{2} = \frac{3125}{5} \\ {x}^{2} = 625 \\ x = \pm \sqrt{625} \\ \boxed{\boxed{x = \pm25}}$