Question
Solve:
$36 a^2+36 a+9$
$36 a^2+36 a+9$
✓
Answer
$36 a^2+36 a+9$
$=9\left(4 a^2+4 a+1\right)=9\left\{(2 a)^2+2 \times 2 a \times 1+1^2\right\}$
$=9(2 a+1)^2$
$=9(2 a+1)(2 a+1)$
$=9\left(4 a^2+4 a+1\right)=9\left\{(2 a)^2+2 \times 2 a \times 1+1^2\right\}$
$=9(2 a+1)^2$
$=9(2 a+1)(2 a+1)$
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