When and why extraneous solution happen

When and why extraneous solution happen

[vparsa]

Here’s how I do this with my students. I tell them I’m thinking of a number and when you multiply it by itself, you get 64. Most will say it’s 8, but then I tell them it’s -8. That lets them know you have no way of knowing which unique number I started with.

[archiebrew]

I thought that the square route of 9 can equal 3 and -3, since -3 ×-3 = 9, so wouldn't -3 = square route of 9 be a correct answer?

[PLCNerd]

Dear Sir.... Please tell me which model of Wacom tablet and pen are you currently using for this nice looking I want to know as i am interested in making lectures in my local dialect as i am inspired by your

[bethh]

Sal! Do you have any on restrictions on radicands??

[iand]

doesn't this mean algebra itself is flawed??

[cycleunknown]

Why do I have to do this 😭 it makes no sense

[luisclementeortegasegovia]

What happens if there is no solution? How do we call it?

[petchx]

this should be taught in highschool maths :/

[jaisrose]

What do I do if I can’t factor out a (x+1)?

[alitahir]

7:34 Bro you can't write it as an equation:
0×3=0×4
Because when 0 of L.H.S goes to R.H.S it is just like this:
3=0×4/0
Which undefined because 0 cannot be in denominator.