x + x + x + ……. + x(m times) =

(- 5) × (- 5) × (- 5) × … × (- 5) (16 times) =

$(\frac{-3}{7}{)}^7\times (\frac{-3}{7}{)}^6\times (\frac{-3}{7}{)}^{-14}(\backslash frac\{-3\}\{7\})^7\backslash times(\backslash frac\{-3\}\{7\})^6\backslash times(\backslash frac\{-3\}\{7\})^\{-14\}$ =

${12}^{16}\times {12}^{-4}12^\{16\}\backslash times12^\{-4\}$ =

$\frac{x^{17}}{x^{15}}\backslash frac\{x^\{17\}\}\{x^\{15\}\}$ =

125 when expressed In exponential form

$7^{-x}=7^{-5}7^\{-x\}=7^\{-5\}$ then the value of x is

$(-1{)}^{103}(-1)^\{103\}$ =

$(-1{)}^{106}(-1)^\{106\}$ =

The exponential form of age of earth is 4550 million years is …