How do you write the expression #r*r*r*r# using exponents?

3 Answers
Jan 8, 2017

#r^4# .Its the only answer.

Jun 13, 2017

#r*r*r*r=r^4#

Jul 16, 2017

#rxxrxxrxxr = r^4#

Explanation:

The short way to write repeated addition is multiplication.

#4+4+4+4+4 = 5xx4 = 20#

Multiplication is a stronger operation than addition.

In a similar way, the short way to write repeated multiplication is using indices or exponents.

#4xx4xx4xx4xx4 = 4^5 = 1024#

Note the difference between

#r+r+r+r = 4xxr = 4r#

And

#rxxrxxrxxr = r^4#

Indices are stronger than multiplication, which is why in an expression with mixed operations, the order is:

powers and roots
multiply and divide
addition and subtraction