Answer:
10x² - 9x
Step-by-step explanation:
(10x² - 10x - 6) + (x + 6)
10x² - 10x - 6 + x + 6
10x² - 9x - 6 + 6
there is no graph
D
c = √(a² + b²) is correct because to isolate c you need to square root everything while still keeping a^2+b^2 together.