Math Is Fun Forum

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Solve for r

Copy and paste to see question and math work.

https://imgur.com/gallery/e6ySIqm

Bob

Administrator

Registered: 2010-06-20

Posts: 10,198

Re: Solve for r

That looks good to me.

B

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Re: Solve for r

That looks good to me.

B

Very good. It's amazing that I can do this stuff after more than 20 years since my college days ended.

amnkb

Member

Registered: 2023-09-19

Posts: 253

Re: Solve for r

its a even-index root (4) so it needs a plus minus in front

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Re: Solve for r

https://i.imgur.com/HNPg3DX.jpeg

its a even-index root (4) so it needs a plus minus in front

Yes, every time we take the square root, the answer will be positive and negative.