[tex] {3}^{1974} - {3}^{1973} - {3}^{1972} - 5 \times {9}^{986} [/tex]
[tex] = {3}^{1974} - {3}^{1973} - {3}^{1972} - 5 \times { ({3}^{2} )}^{986} [/tex]
[tex] = {3}^{1974} - {3}^{1973} - {3}^{1972} - 5 \times {3}^{2 \times 986} [/tex]
[tex] = {3}^{1974} - {3}^{1973} - {3}^{1972} - 5 \times {3}^{1972} [/tex]
[tex] = {3}^{1972} ( {3}^{2} - 3 - 1 - 5)[/tex]
[tex] = {3}^{1972} (9 - 3 - 1 - 5)[/tex]
[tex] = {3}^{1972} (6 - 1 - 5)[/tex]
[tex] = {3}^{1972} (5 - 5)[/tex]
[tex] = {3}^{1972} \times 0[/tex]
[tex] = 0[/tex]
