Albert thought of a number, added 5, multiplied the result by 2, took away 6 and then divided by 2 to give an answer of 8. what number did albert think of to get his answer? 5

6

Step-by-step explanation:

Let x be the number Albert thought about.

1. Albert thought of a number, added 5, then he got x+5.

2. Albert  multiplied the result by 2, then he got 2(x+5).

3. He took away 6, then the number became 2(x+5)-6.

4. Albert divided the result by 2 to get the number

that is 8.

5. Thus, you can state that

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

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