What is 5x2 - 3x 4x2 6?

To solve the expression (5x^2 - 3x + 4x^2 + 6), first combine like terms. The (x^2) terms (5x^2) and (4x^2) combine to give (9x^2). Then, including the linear term (-3x) and the constant (6), the final expression simplifies to (9x^2 - 3x + 6).