Question

evaluate:(a)8^9÷8^3(b)(a^-3 b^-4)÷(a^-2 b^-4)

Answer 1

a)⤵

${8}^{9} \div {8}^{3} \\ = {8}^{9 - 3} = {8}^{6}$

b) ⤵

${a}^{ - 3} . {b}^{ - 4} \div {a}^{ - 2} . {b}^{ - 4} \\ = {a}^{ - 3 - ( - 4)} . {b}^{ - 4 - ( - 4)} \\ = {a}^{1} . {b}^{0} \\ = a \times 0 = 0$