Question

Simplify (4r^-2)*(2r^-2) Please show your workings.

Answer 1

8r^-4 4*2 -2+(-2)

Answer 2

My book gives the answer 8/r

Answer 3

Chrissy, I'm pretty sure your book's answer is wrong, and tutordiffeq is right.

Answer 4

4r^-2 = 4 / r^2
2r^-2 = 2 / r^2

so we have

(4 / r^2) * (2 / r^2) = 8 / r^4

Answer 5

Check to make sure you typed the question right.