Question

x⁴-81 factorise the following ​

Answer 1

Step-by-step explanation:

${x}^{4} - 81$

$= { ({x}^{2} )}^{2} - {(9)}^{2}$

$= ({x}^{2} + 9)( {x}^{2} - 9)$

$= ( {x}^{2} + 9)( {x}^{2} - {3}^{2})$

$= ( {x}^{2} + 9)(x + 3)(x - 3)$

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Answer 2

Answer:

Step-by-step explanation:

X^4 - 81

X^4 = 81

X = √81

Hence, it is 4 under root

X = 3