Question

Factories =9x^2+y^2+z^2-6xy+2yz-6zx

Answer 1

$9x {}^{2} + y {}^{2} + z {}^{2} - 6xy + 2yz - 6zx$
From above we found that where x is there,there is a minus(➖ )sign. So,
$= ( - 3x) {}^{2} + (y) {}^{2} +( z) {}^{2} \\ + 2 \times ( - 3x) \times y + 2 \times y \times z \\ + 2 \times z \times ( - 3x) \\ = ( - 3x + y + z) {}^{2} \\ = ( - 3x + y + z)( - 3x + y + z)$