Plz answer now what is the value of the expression (2.3 × 107)(1.4 × 10−2) written in scientific notation?

The thing you have to remember here is that the base of 10 is like in both sets of parenthesis, so when you multiply them you add your exponents.  Multiply first the 2.3 and 1.4 to get 3.22, and then 7 + -2 = 5, so your final answer is