Relax

Respuesta :

Space

Answer:

9r³ + 2r⁴

Step-by-step explanation:

Step 1: Write expression

4r³ + 3r⁴ - (r⁴ - 5r³)

Step 2: Distribute negative

4r³ + 3r⁴ - r⁴ + 5r³

Step 3: Combine like terms

9r³ + 2r⁴