Question

Simplify: (5+2v7)^2
A. 25+4v7
B. 53+20v7
C. 53

Answer 1

I don't think you have the problem well represented. Try again, and maybe we can figure it out.

Answer 2

i just edited it

Answer 3

2v7? Not sure what that means.

Answer 4

Sqrt .

Answer 5

I got A. for answer

Answer 6

Correct ?

Answer 7

I don't think so... give me a second.\[(5+2\sqrt{7})^2 =25+20\sqrt{7}+28=53+20\sqrt{7}\]

Answer 8

You've got to be disciplined about using the FOIL method on this kind of problem, or you can use the pattern for sum of squares\[(a+b)^2=a^2+2ab+b^2\]

Answer 9

Got it now?

Answer 10

i think so

Answer 11

Good.