# What is the value of (4times10^-8)times(1times10^-12)?

Dec 31, 2016

$4 \times {10}^{-} 20$

#### Explanation:

This can be rewritten as:

$4 \times 1 \times {10}^{-} 8 \times {10}^{-} 12$

$4 \times {10}^{-} 8 \times {10}^{-} 12$

Using the rule for exponents:

$\textcolor{red}{{x}^{a} \times {x}^{b} = {x}^{a + b}}$

$4 \times {10}^{- 8 + - 12}$

$4 \times {10}^{-} 20$