Sederhanakan penjumlahan dan pengurangan berikut: 7^7 - 7^3 a^4 + a^8

[tex]{7}^{7 } - {7}^{3} = {7}^{4}. {7}^{3} - {7}^{3} = 2401. {7}^{ 3} - {7}^{3} = 2400. {7}^{3} [/tex]

[tex] {a}^{4} + {a}^{8} = {a}^{4} + {a}^{4} . {a}^{4} = (1 + {a}^{4} ).( {a}^{4} )[/tex]