Question
Factorise:
$1-6 x+9 x^2$
$1-6 x+9 x^2$
✓
Answer
$1-6 x+9 x^2$
$=(1)^2-2 \times 1 \times 3 x+(3 x)^2$
$=(1-3 x)^2$
$\{\because a 2-2 a b+b 2=(a-b) 2\}$
$=(1)^2-2 \times 1 \times 3 x+(3 x)^2$
$=(1-3 x)^2$
$\{\because a 2-2 a b+b 2=(a-b) 2\}$
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