Simplify the following expression in $x$:2x+8x2+9−(4−2x−8x2).
Express your answer in the form $ax^2 +bx+c$, where $a$, $b$, and $c$ are numbers.
+2864 2x + 8x2 + 9 - (4 - 2x - 8x2)
There is a negative 1 before the parantheses
2x + 8x2 + 9 - 4 + 2x + 8x2
Which simplifies to
16x2 + 4x + 5
