The terms contain \(x\) and \(x^2\), so they are not like terms. Their coefficients cannot be added to create a new power.

At \(x=2\), the original expression is \(4\times2+7\times4=36\). The claimed answer is \(11\times8=88\), disproving it.

Answer

The expression stays \(4x+7x^2\). At \(x=2\), its value is \(36\), whereas \(11x^3=88\).