Powers and Roots

If the bases are the same you can add or subtract the powers

Powers are also called indices
The index is the power

1) Write down all the numbers less than 50 that are powers of 2 ?

2) Write down all the cube numbers less than 50 ?

Powers

Excel POWER function

Roots

Excel SQRT function

Simplifying Roots

b a = exp ( a * ln(b) )

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Excel - KB 271143
Calculate the Nth root of a number
To find the nth root, raise the number to the power of (1/n)

eg 3 sqr(8) = 8^(1/3) = 2

Square Root

The square root of 9 is 3 because (3*3) = 9
Also use the SQRT Excel function

Cube Root

For example 5 is a cube root of 125 because (5*5*5) = 125

125^(1/3)
Also use the POWER Excel function

Nth Root

value^(1/n)