Which shows 232 - 172 being evaluated using the difference of perfect squares method?

232 - 172 = (529 + 289)(529 - 289) = 196,320

232 - 172 = 529 - 289 = 240

232 - 172 = (23 + 17)(23 - 17) = (40)(6) = 240

232 - 172 = (23 - 17)2 = (6)2 = 36

Question

Which shows 232 - 172 being evaluated using the difference of perfect squares method? 

 232 - 172 = (529 + 289)(529 - 289) = 196,320 

 232 - 172 = 529 - 289 = 240 

 232 - 172 = (23 + 17)(23 - 17) = (40)(6) = 240 

 232 - 172 = (23 - 17)2 = (6)2 = 36

anonymous · Answer

its B...=529-289=(23)^2-(17)^2

anonymous · Answer

to me, none of them. :(  it's quite simple, no matter what method is, the final solution must be 60 , but non of the options is 60 :( I fail this question

camerondoherty · Answer

*confused*

camerondoherty · Answer

@marissalovescats

dan815 · Answer

$$23^2-17^2=(23+17)(23-17) = 40*6=240$$

anonymous · Answer

what the.... hahahaa 23^2 not 232