I need help with thus problem G(x)=2x^2+x

Question

Determine g(x+a)-g(x)

so we started with g(x)=2x^2+x

Answer 1

g(x) = 2x² + x

So, g(x+a) - g(x) = 2(x+a)² + (x+a) - (2x² + x) = 2(x² + 2ax + a²) + x + a - 2x² - x = 4ax + 2a² + a