Answer:
Step-by-step explanation:
a^3 - 2a^2 - 3a^2 + 4a^3
5a^3 - 5a^2
First, we use distributive property:
Now, remember that , then
Then,
3x+5+37 =90
3x+42 =90
3x =90-42
3x =48
x =16
The second one