Ive been having trouble understanding how to combine like terms when multiplication is distributed over addition. If anyone could help it would be great. Two problems that i have banging my head over are the following :p
4(2x3 + x2) - 5x2
= 8x3 - x2 'books answer
I end up getting 8x3 + 4x2 - 5x2
Here is another one..... 3(5c) - 15c2 + c
-15c2 + 16c 'books answer
Now 3 * 5c would give us 15c.
15c - 15c2 or 15c + (-15c2)
should gives us 0 c1 which boils down to c
so i end up with c + c. :confused:
