Factorise:36a2 + 36a + 9
We have:
$36 a^{2}+36 a+9=(6 a)^{2}+2 \times 6 a \times 3+(3)^{2}$
$=(6 a+3)^{2}$
$\therefore 36 a^{2}+36 a+9=(6 a+3)^{2}$
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