Answer
$-2x^{2}+42x+1582$
Work Step by Step
We distribute the minus ( the $-1$) over the parentheses,
$...=-2.6x^{2}+49x+3994+0.6x^{2}-7x-2412$
Next, we group like terms, ($x^{2}$ with $x^{2})$ + ($x$ with $x$) + (constants with constants)
$=(-2.6x^{2}+0.6x^{2})+(49x-7x)+(3994-2412)$
... and, simplify
$= -2x^{2}+42x+1582$
