Question

Add.

Answer 1

Here is how you are going to add the given polynomials:
3x^4     - 2x^3              -11
12x^4              +x^2     +1    <<< Add these using the normal addition process
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15x^4 - 2x^3  +x^2 -10
Therefore, the answer would be the last option: 15x4 – 2x3 + x2 – 10
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