Respuesta :

Space

Answer:

x = ±20

Step-by-step explanation:

Step 1: Write equation

x² = 400

Step 2: Square root both sides

x = ±√400

x = ±20

Step 3: Check

Plug in x to verify it's a solution.

20² = 400

400 = 400

(-20)² = 400

400 = 400
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