Answer:
answer is 7
Explanation:
4b squared minus 9,16 is 4b squared because 4 time 4 is 16.thats how you would solve squared.then you want to minus 16 by 9,then your answer should be 7.
(2b - 3)(2b + 3)
4b² - 9 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
4b² = (2b)² ⇒ a = 2b and 9 = 3² ⇒ b = 3, so
4b² - 9 = (2b)² - 3² = (2b - 3)(2b + 3)
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