Question

factroise this by using identity

Answer 1

Heya.

$9 {x}^{2} + 6xy + {y}^{2} \\ \\ = \geqslant (3 x ) {}^{2} + 2 \times 3x \times y + ( {y})^{2} \\ \\ = \geqslant (3x + y) {}^{2} \\ \\ = \geqslant (3x + y)(3x + y)$

Mate ...