Step-by-step explanation:
Q.6
[tex]x = - 4[/tex]
[tex]y = 5[/tex]
[tex] \: [/tex]
[tex] = {x}^{3} {y}^{2} - {x}^{2} y + 2xy[/tex]
[tex] = {( - 4)}^{3} . {5}^{2} - {( - 4)}^{2} .5 + 2.( - 4).5[/tex]
[tex] = ( - 64).25 - (16).5 + ( - 40)[/tex]
[tex] = - 1.600 - 80 - 40[/tex]
[tex] = - 1.720[/tex]
[tex] \: [/tex]
[tex] \: [/tex]
Q.7
[tex] = {x}^{2} . {y}^{3} - {x}^{2} .y + 2xy[/tex]
[tex] = {( - 4)}^{2} . {5}^{3} - {( - 4)}^{2} .5 + 2.( - 4).5[/tex]
[tex] = 16.125 - (16).5 + ( - 80)[/tex]
[tex] = 2.000 - 80 - 80[/tex]
[tex] = 1.840[/tex]
