Question
Factorise the following using the identity $a^2- b^2= (a + b)(a - b).$
$25 a x^2-25 a$
$25 a x^2-25 a$
✓
Answer
$25 a x^2-25 a$
$= 25a(x - 1)(x + 1)$
$= 25a(x - 1)(x + 1)$
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