Question

calcule e simplifique  a)  (2x³+3x²-2x+1) +(-2x³-3x²+7x-2)=     b)(3x-4y+7z)+2x-3y-z )=   

Answer 1

a) (2x³+3x²-2x+1) + (-2x³-3x²+7x-2) = 0
2x³+3x²-2x+1-2x³-3x²+7x-2 = 
5x-1 = 0
5x = 1
x = 1/5

b) (3x-4y+7z)+(2x-3y-z) = 
3x-4y+7z+2x-3y-z = 
5x-7y+6z