Subtract.
Your answer should be a polynomial in standard form.
(
6
y
2
−
9
y
+
4
)
−
(
−
7
y
2
+
5
y
+
1
)

Step-by-step explanation:

(−8* y^2−9*y)+(8*y^3+9*y^2−2*y) 

first, remove extraneous parentheses (or distribute if negative)

=−8* y^2−9*y+8*y^3+9*y^2−2*y  

then group terms in decreasing degree of y (variable)

=+8*y^3 −8* y^2+9*y^2  −9*y−2*y

simply expression by adding/subtracting similar terms

=+8*y^3 +y^2  −11*y

to give the final answer.

b