# How do you find the sum or difference of (4rxt-8r^2x+x^2)-(6rx^2+5rxt-2x^2)?

$\left(4 r x t - 8 {r}^{2} x + {x}^{2}\right) - \left(6 r {x}^{2} + 5 r x t - 2 {x}^{2}\right)$
$= 4 r x t - 8 {r}^{2} x + {x}^{2} - 6 r {x}^{2} - 5 r x t + 2 {x}^{2}$ expand brackets
$= - r x t - 14 {r}^{2} x + 3 {x}^{2}$ collect like terms