## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$3x^2-4x$
Combine like terms to obtain: $=3x^2+(5x-10x+x)$ (group like terms) $\\=3x^2+(5-10+1)x$ (factor out x) $\\=3x^2+(-4)x \\=3x^2-4x$