★ (x² + 6x - 5) + (2x² + 15)
➠ x² + 6x - 5 + 2x² + 15
By combining similar terms, we ge[tex]t[/tex]
➠ x² + 2x² + 6x - 5 + 15
➠ 3x² + 6x - 10
By taking 3x common, we get
➠ 3x(x + 2) - 10
