Answer:
[tex]x[/tex] = 7
Step-by-step explanation:
10[tex]x[/tex]² + 9 = 499
10[tex]x[/tex]² = 499 - 9
10[tex]x[/tex]² = 490
[tex]x[/tex]² = 49
[tex]x[/tex] = 7
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