Answer:
4x² +4x -20
Explanation:
You want the difference between 6x² -5x -12 and 2x² -9x +8.
Difference
The difference is found by subtraction. This is the same as adding the opposite.
(6x² -5x -12) - (2x² -9x +8)
= 6x² -5x -12 -2x² +9x -8
= (6 -2)x² +(-5 +9)x +(-12 -8)
= 4x² +4x -20
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