Answer: The required simplified form is
![-7x^2-28x.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xone2wodze4wolev5f6cbzaw35vfwwe86n.png)
Step-by-step explanation: We are given to simplify the following expression :
![E=4x(3x-7)-19x^2~~~~~~~~~~~~~~~~~~~~~~~~~~(i)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/64whjcx1tsc8julpsraba7mab7zgcdaoi1.png)
We will try to simplify the bracket first an then will combine the terms as much as possible.
From (i), we have
![E\\\\=4x(3x-7)-19x^2\\\\=12x^2-28x-19x^2\\\\=-7x^2-28x.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/fuxldkhnrfpi13yisovgetn9lg4foe3y6a.png)
Thus, the required simplified form is
![-7x^2-28x.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xone2wodze4wolev5f6cbzaw35vfwwe86n.png)