Question

(2a + b)2-9 factorise the sum please​

Answer 1

Answer:

(2a + b + 3)(2a + b - 3)

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Step-by-step explanation:

(2a + b)² - 9

= (2a + b)² - (3)².

(x + y)(x - y) = x² - y²

Let us assume 2a + b = x and 3 = y.

then, we have:

(2a + b)² - (3)² = (2a + b + 3)(2a + b - 3)