Factorise:

Question:

Factorise:

$5-20 x^{2}$

 

Solution:

$5-20 x^{2}$

$=5\left(1-4 x^{2}\right)$

$=5\left[1^{2}-(2 x)^{2}\right]$

$=5(1+2 x)(1-2 x) \quad\left[a^{2}-b^{2}=(a+b)(a-b)\right]$

 

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