Question

x⁴- 400 factorise.
immediate ly​

Answer 1

Answer:

(x^2 + 20) (x^2 - 20)

Step-by-step explanation:

x⁴- 400

(x^2)^2 - (20)^2         [a^2 - b^2 = (a+b) (a-b)]

(x^2 + 20) (x^2 - 20)

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