Answer:
(2m - 1)(2m + 1)
Explanation:
given
4m² - 1 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b), so
4m² - 1
= (2m)² - 1² [ with a = 2m and b = 1 ]
= (2m - 1)(2m + 1)
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