square roots

[Guest]

(3 sqrt a+2)^2

(3sqrt (a)+2)(3sqrt (a)+2)

I reviewed the square root session you gave me earlier and I didn't see this. I think I can use the FOIL method here

9a +6sqrt(a)+6sqrt(a)+4

9a+12sqrt(a)+4

 

[Unco]

Excellent work.

After a while you'll get so good at these that you'll skip FOIL on perfect squares:
\(\displaystyle (a \, + \, b)^2 = a^2 \, + \, 2ab \, + \, b^2\).

 

[Denis]

(3 sqrt a+2)^2 : you forgot to bracket the a :evil:

(3sqrt (a)+2)(3sqrt (a)+2)

I reviewed the square root session you gave me earlier and I didn't see this. I think I can use the FOIL method here

9a +6sqrt(a)+6sqrt(a)+4

9a+12sqrt(a)+4

 

[Guest]

Jez Denis, only on the first one.