Thread: Squares and routes

If I want to cancel a square a.k.a 4^2 do I multiply or add it to the square route of said number (4 here)

Originally Posted by Mukilab

If I want to cancel a square a.k.a 4^2 do I multiply or add it to the square route of said number (4 here)

This small isolated part of what is clearly a larger question makes no sense without more context.

You don't add or multiply the square root, you 'take' the square root.

I.e you may have and you want to find

which is the same as



now you can see you can take the square root of both sides.



which in turns yields



As square and square root are opposites.

Now go ahead and change the world!

Originally Posted by mr fantastic

This small isolated part of what is clearly a larger question makes no sense without more context.

No, I just need to know this for a simultaneous equation. If I need to cancel out a 4^2 do I use multiply by \sqrt{4} or add by \sqrt{4}

I am starting to agree with this comment

Originally Posted by mr fantastic

This small isolated part of what is clearly a larger question makes no sense without more context.

You have confused me friend, please post the full question, I can't read your mind!

Originally Posted by pickslides

I am starting to agree with this comment



You have confused me friend, please post the full question, I can't read your mind!

....

By eliminating y find solutions to the simultaneous equations

x^2+y^2=25
y=2x-2

Originally Posted by Mukilab

....

By eliminating y find solutions to the simultaneous equations

x^2+y^2=25
y=2x-2

Substitute y=2x-2 into x^2+y^2=25, expand, simplify and solve the quadratic for x. Then substitute the values of x into y=2x-2 to get y.