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Simplify (2.8 × 10^−9) − (6.9 × 10^−8). Write the final answer in scientific notation.

2 Answers

4 votes
the answer would be -6.62 x 10^-8
User WildGoose
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7.4k points
2 votes

Answer:

-6.62 × 10^(-8)

Explanation:

To simplify the expression (2.8 × 10^−9) − (6.9 × 10^−8), we need to perform the subtraction and then express the result in scientific notation.

(2.8 × 10^−9) − (6.9 × 10^−8) = 2.8 × 10^(-9) - 6.9 × 10^(-8)

To subtract the numbers, we need to ensure that they have the same exponent (power of 10). To do this, we can rewrite 2.8 × 10^(-9) as 0.28 × 10^(-8):

(2.8 × 10^−9) − (6.9 × 10^−8) = 0.28 × 10^(-8) - 6.9 × 10^(-8)

Now, we can subtract the numbers:

0.28 × 10^(-8) - 6.9 × 10^(-8) = (0.28 - 6.9) × 10^(-8) = -6.62 × 10^(-8)

The result is -6.62 × 10^(-8) in scientific notation.

User Giorgos Keramidas
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7.8k points

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