Which numbers should be multiplied to obtain 175^2 - 124^2?

51 and 299

51 and 51

2601 and 2601

30501 and 30749
so i multiplied 175 by 175 and got 30,625
and then multiplied 124 by 124 and got 15,376

so im really confused bc none of the answers have to do with the numbers i got.

can someone please help me?

Question

Which numbers should be multiplied to obtain 175^2 - 124^2?

 51 and 299

 51 and 51

 2601 and 2601

 30501 and 30749
so i multiplied 175 by 175 and got 30,625
and then multiplied 124 by 124 and got 15,376

so im really confused bc none of the answers have to do with the numbers i got.

can someone please help me?

hartnn · Answer

use this relation $\Large a^2-b^2 = (a+b)(a-b)$

hartnn · Answer

a= 175, b= 124
you just need a+b and a-b

anonymous · Answer

|dw:1408904172017:dw|

anonymous · Answer

so it would be A

thank you so much!!

hartnn · Answer

yep, thats correct :)
welcome ^_^

anonymous · Answer

wait i have one more question

anonymous · Answer

Which of the following is an actual zero of f(x) = x3 + 5x2 - 4x - 20?

 -20

 -5

 1

 4

ok so i worked it out and got X=2, -5,-2

and i put the answe as -5 bc that was the only one there is that correct?

hartnn · Answer

yes, that is also correct :)

anonymous · Answer

ok thank you so much

hartnn · Answer

:)