Question

Equação incompleta me ajudem
10x²-490=0

Answer 1

10x²= 490
x²= 490/10
x²= 49
x=±√49
x=±7

Answer 2

$10x^2-490=0\\\\10x^2=490\\\\x^2= \dfrac{490}{10}\\\\x^2 = 49\\\\x= \sqrt{49}\\\\x = \pm\,7$