Solve: 10^8 + 10^-4 + (1/10)^-16 Expression with Mixed Powers

Question

108+104+(110)16=? 10^8+10^{-4}+(\frac{1}{10})^{-16}=\text{?}

Video Solution

Solution Steps

00:00 Simply
00:03 To get rid of a negative exponent
00:06 Flip numerator and denominator and the exponent will become positive
00:10 We'll use this formula in our exercise
00:27 The same formula applies to fractions as well
00:30 Flip numerator and denominator and we'll get a positive exponent
00:34 We'll use this formula in our exercise
00:42 And this is the solution to the question

Step-by-Step Solution

Let's use the law of exponents for negative exponents:

an=1an a^{-n} = \frac{1}{a^n} and apply this law to the problem:

108+104+(110)16=108+1104+(101)16 10^8+10^{-4}+(\frac{1}{10})^{-16}=10^8+\frac{1}{10^4}+(10^{-1})^{-16} when we apply the above law of exponents to the second term in the sum, and the same law but in the opposite direction - we'll apply it to the fraction inside the parentheses of the third term in the sum,

Now let's recall the law of exponents for exponent of an exponent:

(am)n=amn (a^m)^n=a^{m\cdot n} we'll apply this law to the expression we got in the last step:

108+1104+(101)16=108+1104+10(1)(16)=108+1104+1016 10^8+\frac{1}{10^4}+(10^{-1})^{-16}=10^8+\frac{1}{10^4}+10^{(-1)\cdot(-16)}=10^8+\frac{1}{10^4}+10^{16} when we apply this law to the third term from the left and then simplify the resulting expression,

Let's summarize the solution steps, we got that:

108+104+(110)16=108+1104+(101)16=108+1104+1016 10^8+10^{-4}+(\frac{1}{10})^{-16}=10^8+\frac{1}{10^4}+(10^{-1})^{-16} =10^8+\frac{1}{10^4}+10^{16} Therefore the correct answer is answer A.

Answer

108+1104+1016 10^8+\frac{1}{10^4}+10^{16}