Question

(18x²yz - 28x²y²z³ + 32 y²z²) by-4xy​

Answer 1

$\dfrac{18x^2yz-28x^2y^2z^3+32y^2z^2}{-4xy}$

$\mathrm{Apply\:the\:fraction\:rule}:\quad \dfrac{a}{-b}=-\dfrac{a}{b}$

$=-\dfrac{18x^2yz-28x^2y^2z^3+32y^2z^2}{4xy}$

$=-\dfrac{z\left(9x^2-14x^2yz^2+16yz\right)}{2x}$