Adding exponents

How to add exponents.

Adding numbers with exponents

Adding exponents is done by calculating each exponent first and then adding:

an + bm

Example:

42 + 25 = 44+22222 = 16+32 = 48

Adding same bases b and exponents n:

bn + bn = 2bn

Example:

42 + 42 = 242 = 244 = 32

Adding negative exponents

Adding negative exponents is done by calculating each exponent first and then adding:

a-n + b-m = 1/an + 1/bm

Example:

4-2 + 2-5 = 1/42 + 1/25 = 1/(44)+1/(22222) = 1/16+1/32 = 0.09375

Adding fractional exponents

Adding fractional exponents is done by raising each exponent first and then adding:

an/m + bk/j

Example:

33/2 + 25/2 = √(33) + √(25) = √(27) + √(32) = 5.196 + 5.657 = 10.853

 

Adding same bases b and exponents n/m:

bn/m + bn/m = 2bn/m

Example:

42/3 + 42/3 = 242/3 = 2 3√(42) = 5.04

Adding variables with exponents

Adding exponents is done by calculating each exponent first and then adding:

xn + xm

With same exponents:

xn + xn = 2xn

Example:

x2 + x2 = 2x2

 


See also

Write how to improve this page