Question

x^4-16 factorise completely no useless answer​

Answer 1

Answer:

Rewrite x4 as (x2)2 ( x 2 ) 2 . Rewrite 16 as 42 . Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) a 2 - b 2 = ( a + b ) ( a - b ) where a=x2 a = x 2 and b=4 .

Step-by-step explanation:

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Answer 2

Answer:

the identity used is (a^2-b^2) = (a-b)(a+b)

Step-by-step explanation:

x^4-16

(x^2)^2-4^2

(x^2-4)(x^2+4)

(x^2-2^2)(x^2+4)

(x-2)(x+2)(x^2+4)