Maths-

General

Easy

Question

# Evaluate 8.6 × 10^{-4} - 4.2 × 10^{-7}

Hint:

### In Mathematics, lets say, "a" represents a number and "n" is the number of times that number is to be multiplied with itself, in order to get a desired result. Then, such result can be written as an, where a is called the base and n is its power/ exponent.

an = a × a × ... × a n times.

## The correct answer is: Simplifying the given expression, we get- 0.000859958 or 8.59958 × 10-4.

### Step-by-step solution:-

8.6 × 10^{-4} - 4.2 × 10^{-7}

= 0.00086 - 0.000000042

= 0.000859958

= 8.59958 × 10^{-4}

Final Answer:-

∴ Simplifying the given expression, we get- 0.000859958 or 8.59958 × 10^{-4}.

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