To subtract the two numbers in scientific notation, we need to make sure the exponents are the same. Let's rewrite the numbers with the same exponent:
8.3 × 10⁹ = 8.3 × 10⁹
2.1 × 10⁷ = 0.021 × 10⁹
Now we can subtract:
8.3 × 10⁹ - 0.021 × 10⁹ = (8.3 - 0.021) × 10⁹
The result is 8.279 × 10⁹.
Express your answer in scientific notation.
8.3 × 10⁹ - 2.1 × 10⁷
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