Answer:
Step-by-step explanation:
Given that
z³+2z²-x+x-2x+z(3z+4y²)+1-5z³+½zy²
Simplifying and opening bracket
Let open the bracket first
z³+2z²-x+x-2x+z(3z+4y²)+1-5z³+½zy²
z³+2z²-x+x-2x+3z²+4zy²+1-5z³+½zy²
Collecting like terms
z³-5z³+2z²+3z²+4zy²+½zy²-x+x-2x+1
-4z³+5z²+4½zy²-2x+1. Answer
2. 4apples+7 oranges +3apples
Collect like terms
4apples + 3apples + 7 oranges
7apples + 7 oranges
Note, we cannot add orange to apples. For example, if your dad want you to buy him 4 apples and your mum wants you to buy him 7 oranges and your brother wants you to buy him 3apples too, they all send you at the same time, you won't get to the fruit vendor and say you wants to buy 14 apples oranges or say you want to you 14 fruits, you will rather say you want to buy 7apples and 7 oranges or if you are not smart enough you will say you want to buy 4apples, 7oranges and 3apples, the seller will understand that too.
3. (x²y-3y²+5xy²)-(-x²y+3xy-3y²)
We need to know that
+×+=+. -×-=+. -×+=- +×-=-
Then let open the bracket
+(x²y-3y²+5xy²)-(-x²y+3xy-3y²)
x²y-3y²+5xy²+x²y-3xy+3y²
Collect like terms
x²y+x²y+3y²-3y²+5xy²-3xy
2x²y+5xy²-3xy.
