Question

What is - 2.1x² + 3 – 0.5x²_1​

Answer 1

-2.6x^2 - 2

Explanation:

I must assume that by " x²_1 " you actually meant " x² - 1."

If that's the case, then our focus becomes simplifying the given expression:

- 2.1x² + 3 – 0.5x² - 1 => -2.6x^2 - 2 (answer)