Question

Factorise completely 4x2-16y2

Answer 1

Step-by-step explanation:

$4 {x}^{2} - 16 {y}^{2} \\ (2x) {}^{2} - (4y) {}^{2} \\ (2x + 4y)(2x - 4y) \\ (x + 2y)(x - 2y)$

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Answer 2

by a^2-b^2=(a+b)(a-b)

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