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= 3x²-2x+5+x²+4x-3
= 3x²+x²-2x+4x+5-3
= 4x²+2x+2
2(5y²-3) - (4y²-3y+2)
= 10y²-6-4y²+3y-2
= 10y²-4y²+3y-6-2
= 6y²+3y-8
3x²-2x+5 + x²+4x-3 =
4x² + 2x - 2
b. 2(5y²-3) - (4y²-3y+2) =
10y²- 6 - 4y² + 3y -2 =
6y² + 3y - 8