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