Question
Factorise:
$a^2 b^2-6 a b c+9 c^2$
$a^2 b^2-6 a b c+9 c^2$
✓
Answer
$a^2 b^2-6 a b c+9 c^2$
$= (a b)^2-2 \times a b \times 3 c+(3 c)^2$
$= (a b-3 c)^2$
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