Question

Simplify 2-3z²+5yz+7y²-8+z²-6yz-9y²+1-2z²-2yz-y²​

Answer 1

Step-by-step explanation:

$= (2 - 8 + 1) + ( - 3 - 2 + 1) {z}^{2} + (5 - 6 - 2)yz + (7 - 9 - 1) {y}^{2} \\ = ( - 5) + ( - 4 ){z}^{2} + ( - 3)yz + ( - 3) {y}^{2} \\ = - 5 - 4 {z }^{2} - 3yz - 3 {y}^{2}$

Answer 2

Step-by-step explanation:

=(2-8-1)+(-3-2-1)z²+(5-6-2)yz+(

=(-5)+(-4)z²+(-3)yz+(-3)y²

= -5-4z²-3yz-3y2