If x 8 = 5 , what is the value of 8 x ?

Question

Accepted Answer

The correct answer is 1 5 . Since the number 5 can also be written as 5 1 , the given equation can also be written as x 8 = 5 1 . This equation is equivalent to 8 x = 1 5 . Therefore, the value of 8 x is 1 5 . Note that 1/5 and .2 are examples of ways to enter a correct answer. Alternate approach: Multiplying both sides of the equation x 8 = 5 by 8 yields x = 40 . Substituting 40 for x into the expression 8 x yields 8 40 , or 1 5 .

Question if-x-8