Question

a^2 + 6ab + 9b^2 - c^2

factorise​

Answer 1

Answer:

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(a-2b)^2

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Step-by-step explanation:

Answer 2

Answer:

(a+3b+c)(a+3b-c)

Step-by-step explanation:

${a}^{2} - 6ab + 9 {b}^{2} - {c}^{2} \\ = {(a)}^{2} + 2 \times a \times 3b + {(3b)}^{2} - {c}^{2} \\ = {(a + 3b)}^{2} - {(c)}^{2} \\ = ((a + 3b) + c)((a + 3b) - c) \\ = (a + 3b + c)(a + 3b - c)$