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9x² - 16 Sacas
√9x² = 3x
√16 = 4
9x² - 16 = ( 3x + 4)(3x -4)
x⁴ - 25x² Sacas
√x⁴ = x²
√25x² = 5x
x⁴ - 25x² = (x² +5x)(x² -5x)
(3 + x)² -1 sacas
√(3 +x)² = 3 +x
√1 = 1
(3 + x)² - 1 = (3 + x +1)( 3 +x -1) = (4 +x)(2 +x)