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(I)2a-5
(2 × -2)-5
-4-5
-9
(ii)6a-3b
(6 × -2)-(3 ×-1)
-12-(-3)
-12+3
-9
(iii)8a-15b
(8 × -2)-(15 × -1)
-16-(-15)
-16+15
-1
iv.a^2-2b+5
(-2 × -2)-(2 × -1)+5
4-(-2)+5
4+2+5
11
(v)a^3-b^3
(-2)^3+(-1)^3
-8-1
-9
(vi)-2ab^2+2a^2b+4
-(-2 × -2 × -1 × -1)+(2 ×-2 × -2 ×-1)+4
-4-8+4
-8
(2 × -2)-5
-4-5
-9
(ii)6a-3b
(6 × -2)-(3 ×-1)
-12-(-3)
-12+3
-9
(iii)8a-15b
(8 × -2)-(15 × -1)
-16-(-15)
-16+15
-1
iv.a^2-2b+5
(-2 × -2)-(2 × -1)+5
4-(-2)+5
4+2+5
11
(v)a^3-b^3
(-2)^3+(-1)^3
-8-1
-9
(vi)-2ab^2+2a^2b+4
-(-2 × -2 × -1 × -1)+(2 ×-2 × -2 ×-1)+4
-4-8+4
-8
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