Answer:
[tex]\left(9x^{4}-7x^{2}-2\right)[/tex]
Step-by-step explanation:
[tex]\left(5+8x^{4}-6x^{2}\right)+(x^{4}-x^{2}-7)[/tex] Combine like terms by looking at the exponents.
[tex]\left(9x^{4}-7x^{2}-2\right)[/tex]
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