cant find the answer this problem is called factoring special cases and i need u to work it out and give me the rite answer and u can used the foil method to check it and this is what i got
multiplies of 5: 1, 5, k, k
multiplies of 245:1, 5, 7, 35, 49, 245
greatest common factor: 1
5 (k^2 - 49)
5 (k + 7) (k - 7)
foil method check
5(k+7 ) (k-7 )
5 (k ) (k) - (k) (7) + (k) (7) - (7) (7)
5 (k^2 - 7k + 8k - 49 )
5 (k^2 - 49)
5k^2 -49
is this rite
2006-11-29 12:25:32 · 4 answers · asked by Shante R 1 in Science & Mathematics ➔ Mathematics
It looks like you have a typo in part of your check, where you put 8 instead of 7. But I see what you meant there.
Your only problem is that you didn't apply the distributive property correctly.
When you multiply 5 and (k^2 - 49), you have to multiply the 5 by everything in the parentheses:
5 (k^2 - 49) = (5*k^2) - (5*49) = 5k^2 - 245
Notice that we get back what you started with.
Your factoring was correct, but you have that one small problem in your check.
Keep at it!
2006-11-29 12:30:14 · answer #1 · answered by hokiejthweatt 3 · 0⤊ 0⤋
on your 5(k^2 - 49)
that should be 5k^2 - 245, not 5k^2 - 49
2006-11-29 14:15:06 · answer #2 · answered by Sherman81 6 · 0⤊ 0⤋
The last step should read 5k^2-245, but other than that you are correct.
2006-11-29 12:30:27 · answer #3 · answered by Nicknamr 3 · 0⤊ 0⤋
Hello
2016-05-23 03:36:56 · answer #4 · answered by Susan 4 · 0⤊ 0⤋