Question

factories: 16A square+72A+81​

Answer 1

Step-by-step explanation:

$16 {a}^{2} + 72a + 81 \\ = 16 {a}^{2} + 36a + 36a + 81 \\ = 4a(4a + 9) + 9(4a + 9) \\ = (4a + 9)(4a + 9) \\ = {(4a + 9)}^{2}$

Identity used:

(a+b)²= a²+2ab+b²

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