Factorise: 5-20 x^2 - Vidyadip

Question

Factorise:
$5-20 x^2$

✓

Answer

$5-20 x^2$
$=5\left(1-4 x^2\right)$
$=5\left[(1)^2-(2 x)^2\right]$
$=5[(1-2 x)(1+2 x)]$
$=5(1-2 x)(1+2 x)$

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