Question

Factor the four-term polynomial.



mn - 15 + 3m - 5n



(m + 3)(n - 5)
(n - 3)(m - 5)
(n + 3)(m - 5)

Answer 1

I think it is the 1st one

Answer 2

Nope

Answer 3

okay how do u do it

Answer 4

You should multiply out each of those expressions...you need the practice!

Answer 5

The 1st one:
\[(m+3)(n-5) = mn -5m + 3n - 15\]

Answer 6

wat

Answer 7

Let (m+x) (n+y) = mn - 15 + 3m - 5n
=> mn+ym+xn+xy=mn-15+3m-5n

Answer 8

U need to find x and y from there

Answer 9

\[(a+b)(c+d) = a(c+d) + b(c+d) = ac + ad + bc + bd\]

If you want to be clever, note that to get a +3m, you need to have a +3 multiply an m, and there's only one such equation.

Answer 10

comparing coffecients gives:
x=-5 and y=3

Answer 11

so, (m+x) (n+y) = mn - 15 + 3m - 5n = (m-5)(n+3)

Answer 12

got it

Answer 13

so its the last one

Answer 14

yep

Answer 15

okay lol help me again please