Which shows 602 - 402 being evaluated using the difference of squares method?

a. 602 - 402 = (3600 + 1600)(3600 - 1600) = 10,400,000
b. 602 - 402 = 3600 - 1600 = 2,000
c. 602 - 402 = (60 - 40)2 = 202 = 400
d. 602 - 402 = (60 + 40)(60 - 40) = (100)(20) = 2,000

medals given!

Question

Which shows 602 - 402 being evaluated using the difference of squares method?

a. 602 - 402 = (3600 + 1600)(3600 - 1600) = 10,400,000 
b. 602 - 402 = 3600 - 1600 = 2,000 
c. 602 - 402 = (60 - 40)2 = 202 = 400 
d. 602 - 402 = (60 + 40)(60 - 40) = (100)(20) = 2,000

medals given!

compphysgeek · Answer

assuming that 602 - 402 means $60^2 - 40^2 $ answer d is correct. $$ (a + b) \times (a - b) = a^2 - b^2$$