Adding Polynomial Expressions. (
SIMPLIFY
#1
(ab^2+13b-9)+(6-4a+3ab^2)+(a+7b)< br />
#2
(9x^3-2x^2-x)+(3x)+x^3-4)+(x^2-3x )

4ab^2 +20b - 3 -3a

Step-by-step explanation:

#1

4ab^2 + 20b - 3a -3

#2

10x^3 - x^2 - x - 4

Step-by-step explanation:

Combine like terms.

Combine ab, b, a terms for #1

Combine x^3, x^2, x terms for #2

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: