Evaluate Using Scientific Notation (210^7)(210^8)

$(2 \cdot 10^{7}) (2 \cdot 10^{8})$

Group coefficients together and exponents together to multiply numbers in scientific notation.

$(2 \cdot 2) (10^{7} \cdot 10^{8})$

Multiply $2$ by $2$ .

$4 (10^{7} \cdot 10^{8})$

Multiply $10^{7}$ by $10^{8}$ by adding the exponents.

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$4 \cdot 10^{7 + 8}$

Add $7$ and $8$ .

$4 \cdot 10^{15}$

Evaluate Using Scientific Notation (2*10^7)(2*10^8)