Answer:
(2x - 1)(2x + 1)
Explanation:
4x² - 1
is a difference of squares and factors in general as
a² - b² = (a - b)(a + b) , then
= (2x)² - 1²
= (2x - 1)(2x + 1)
That is a quadratic equation and must be factorized using two brackets. It is just a little confusing to recognize it as a quadratic as the middle x value is not there so we treat it as 0 - which means the two numbers must cancel each other out:
(2x + 1) (2x - 1)
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