Question

Factorise using identities
x4
$x 4$
- 25​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

${x}^{4} - 25 \\ according \: to \: identity \\ a {}^{2} - b {}^{2} = (a + b)(a - b) \\ ( {x}^{2} ) {}^{2} - (5) {}^{2} = ( x {}^{2} + 5)(x {}^{2} - 5) \\ = x {}^{4} - 5x {}^{2} + 5x {}^{2} - 25 \\ = x {}^{4} - 25$

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