Answer:
[tex](8x^4-7)+(3-2x^3 +9x^4) =17x^4 -3x^3 -4[/tex]
Step-by-step explanation:
Here, the given expression is: [tex](8x^4-7)+(3-2x^3+9x^4)[/tex]
Simplifying the given expression, we get:
[tex](8x^4-7)+(3-2x^3 +9x^4) = (8x^4+9x^4 -3x^3 -7 +3)\\= 17x^4-3x^3 - 4\\\implies (8x^4-7)+(3-2x^3 +9x^4) = 17x^4-3x^3 - 4[/tex]
Hence, on simplification : [tex](8x^4-7)+(3-2x^3 +9x^4) = 17x^4 -3x^3 -4[/tex]
