To add the polynomial expressions \(3 - 2p - 5p^2\) and \(p^4 - 3p + 4\), we simply combine like terms.
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Start with the first polynomial: \[ 3 - 2p - 5p^2 \]
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Add the second polynomial: \[
- (p^4 - 3p + 4) \]
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Combine like terms:
- The \(p^4\) term: \(p^4\)
- The \(p^2\) term: \(-5p^2\)
- The \(p\) terms: \(-2p - 3p = -5p\)
- The constant terms: \(3 + 4 = 7\)
Putting it all together, we have: \[ p^4 - 5p^2 - 5p + 7 \]
So, the sum of the polynomials is: \[ \boxed{p^4 - 5p^2 - 5p + 7} \]