Answer
$$8.3x^3 +.3x^2 -23$$
Work Step by Step
Recall, standard form is $ax^2+bx+c$. Thus, combining like terms, we find:
$$ -8.3x^3 + (15-14.7)x^2 -23 \\ 8.3x^3 +.3x^2 -23$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.