Question

pls tell me fast its really important​

Answer 1

Answer:

2x^4+15x^3-3

Step-by-step explanation:

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Answer 2

Answer:

$( {8x}^{3} - 6 + 3 {x}^{4} ) - ( {x}^{4} - 7 {x}^{3} - 3 \\ {8x}^{3} - 6 + 3 {x}^{4} - {x}^{4} + 7 {x}^{3} + 3 \\ 15 {x}^{3} - 3 + 2 {x}^{4} \\ 2 {x}^{4} + 15 {x}^{3} - 3$