(5a+5)(5a+5)

They are both fantastic answers.  Thank you very much.  

Actually I have  a 3rd answer.

(5a+5)(5a+5)    This is a perfect square so there is a nice short cut  

  $$\boxed{(a+b)^2=a^2+2ab+b^2}$$

so

$$(5a+5)^2\\\\ =(5a)^2+2*25a+5^2\\\\ =25a^2+50a+25$$

You have to use the

First

Outside

Inside

Last

method.

5a*5a = 25a²          ---First

5a*5 = 25a        ---Outside

5*5a = 25a           ---Inside

5*5 = 25              ---Last

And now you add all these up for your answer.

25a² +25a + 25a+ 25

25a² + 50a + 25

And there you go, that's your answer.

So we wil solve this like;

$$(5a+5)(5a+5)$$

$$=5a(5a+5)+5(5a+5)$$   (now we will multiply them)

$$=25a^2+25a+25a+25$$   (now we will add the like values)

$$=25a^2+50a+25$$     $$ANSWER$$

i hope uve understood by now but if not then pls be freee to ask!

Hope this helps!

Thank you very much Melody!Your answer is also as fantastic as ours!