Problem: (5x2 + 2x + 11) − (7 + 4x − 2x2)
Find the difference
The way to subtract like this is to multiply
the second set by -1 and then add the result.
This changes all the signs in the second set.
Notice that you are subtracting a NEGATIVE 2x2,
which is the same as ADDING 2x2.
(5x2 + 2x + 11) − (7 + 4x − 2x2)
(5x2 + 2x + 11) + (-7 - 4x + 2x2)
5x2 + 2x2 + 2x - 4x + 11 - 7
7x2 - 2x + 4