Add and write in standard form:
5
(3x² - 4x³ +7x) + (−3x5 +5x+6x² - 2)
9x27x5+12x - 2
A
О
B

-7x10
+9x4 +12x² - 2
C
D
-7x5+9x2+12x - 2
12x5 +18x2 + 35x - 2