Question

(7x² + x) - (9x² + 4x)

Explanation:

Step1: Remove parentheses

To remove the parentheses, we distribute the negative sign to the terms inside the second parentheses. So we have:
\(7x^2 + x - 9x^2 - 4x\)

Step2: Combine like terms

For the \(x^2\) terms: \(7x^2-9x^2=(7 - 9)x^2=- 2x^2\)
For the \(x\) terms: \(x-4x=(1 - 4)x=-3x\)

Answer:

\(-2x^2 - 3x\)