Answer:
Explanation:
To simplify the expression, we need to combine like terms.
(5 + 7x^3 +3x^2) + (-12+5x+6x^2)
= (5 + 7x^3 +3x^2) + (-12 + (5x +6x^2))
Now we combine the x^2 terms:
= (5 + 7x^3 + 9x^2) + (-12 + 5x)
= 7x^3 + 9x^2 + 5 + 5x - 12
= 7x^3 + 9x^2 + 5x - 7
This is the simplified expression.