Question

factorise a⁴-81b⁴. please inform me about it if any one really wants to help me​

Answer 1

(a²-9b²) (a²+9b²)

=(a-3b)(a+3b)(a²+9b²)

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Answer 2

Answer:

(a²-9b²)(a²+9b²)

Step-by-step explanation:

(a²)²-(9b²)²

= (a²-9b²)(a²+9b²) { (a+b)(a-b) =a²-b²}

=(a+3b)(a-3b)(a²+9b²)

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