Question

(2x)²=(x)²+(9)² teorema de Pitágoras

Answer 1

(2x)²=(x)²+(9)²

(2².x²) = x² + 81
4.x² = x² + 81
4.x² - x² = 81
3x² = 81
x² = 81/3
x = √27
x = 3√3