Simplify by combining like terms. (Only do one per group memeber on this 1) 5x^2+3x+x-9

To simplify the expression by combining like terms, we need to group and add the coefficients of similar terms. The given expression is:<br /><br />\[ 5x^2 + 3x + x - 9 \]<br /><br />1. Identify like terms:<br /> - \(5x^2\) is a term with \(x^2\).<br /> - \(3x\) and \(x\) are terms with \(x\).<br /> - \(-9\) is a constant term.<br /><br />2. Combine the like terms:<br /> - For the \(x\) terms: \(3x + x = 4x\).<br /><br />3. Write the simplified expression:<br /> - The expression becomes: \(5x^2 + 4x - 9\).<br /><br />So, the simplified expression is:<br /><br />\[ 5x^2 + 4x - 9 \]