Answer:
2x² + 23
Step-by-step explanation:
Distribute the -5 and combine like terms.
7x² + 3 - 5(x² - 4) =
= 7x² + 3 - 5x² + 20
= 2x² + 23
-8m+24-32n
To expand this, we have to multiply -8 into m, -3, and 4n. Expanding, we get
(-8)(m)+(-8)(-3)+(-8)(4n)
This simplifies to
-8m+24-32n, which is our answer.
Combine all like terms.
Multiply both sides by -1.
