Question

Factorise : x⁴ - 81



please ans
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Answer 1

Answer:

x^4-3^4

(x^2)^2-(3^2)^2

{(x^2+3^2)(x^2-3^2)}

(x^2+9)(x+3)(x-3)✓

Answer 2

Step-by-step explanation:

$(x {}^{2} ) {}^{2} -( 9) {}^{2} \\ using \: identity \: a {}^{2} - {b}^{2} \\ = (a +b)(a - b) \\ = (x {}^{2} + 9)(x {}^{2} - 9) \\ = x {}^{4} - 9 {x}^{2} + 9 {x}^{2} - 81 \\ = {x}^{4} - 81$

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