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He already help me, I not expect help that fast. Thank you Ghost again.

3x-3x=0

that is it

(a - 7)x² + 13x - a = 0 x₁ = 5 .  Find x2 and a

I assume you mean x=5

x^2=25

(a-7)*25+13*5-a=0

25(a-7)+65-a=0

25a-175+65-a=0

24a=175-65

24a=110

a=110/24

and you can finish it :)

I like your little jokes.  Thanks

Yes that is how it is learned.  

The more you know the easier it is to add to that knowledge too.   

Wow, Rochelle !!!....those are some of the most impressive graphics I've seen on here...!!!

Very nice....

Not really......I just fool around with it until it looks like something reasonable....!!!

come on Bio, we need a bit of explanation here!

Why do you need our ghosts help?  

You have his attention.   Now what?

Thanks, Melody.......

You are becoming an expert with GeoGebra Chris 

Thanks for the smile anon.  

Great pic Chris    

Each square measures 9in^2

So, at stage 6, we will have 6 x in^2 = 54in^2

Thank you Rochelle.

Your post looks both attractive and very helpful :)

Here are some you tube clips and other resources.  Perhaps one of these will help.  

Imaginary numbers is a very broad topic so perhaps you cold be more specific and we could help you.  :)

42, because it is the answer to everything

4997 because is like she started counting with 2

2x30=60 boom. answer

We can solve this as a proportion..

(2/7) ton  / (7/8) wall = x tons  / 1 wall    .....cross-multiply......

(2/7)  = (7/8)x     multiply both sides by 8/7 .... so we have..

(8/7)(2/7) = x  = 16/49 tons

1/12 of the lawn in 1/2 hour means that in 1 hour, it does twice as much = 2 x 1/12 = 2/12 = 1/6 of the lawn.

So...if 1/6 is watered in 1 hour, then it must take 6 hours to water the whole lawn....

Hit the 2nd" button, and you will see the "acos" key