1 -since everything includes 4a, we can factor that to get 4a(a-4b^3+2b^2c) 2 - since 5 and 3 add to 8 and multiply to 15, we can do (n+5)(n+3) 3 - since -5 and -4 add to -9 and multiply to 20, we can do (g-5)(g-4) 4 - since -10 and 3 add to -7 and multiply to 30, we can do (z-10)(z+3) 5 - we can factor out 4y to get 4y(y^2-9).
I got the numbers in 2, 3, and 4 with a guesstimating and checking approach
