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= -3a + 5b
b.) = 9y²+4y+12y²+4
= 21y² + 4y +4
c.) = .2x(X²+4x-2)-3x²(x+5)
= 2x³ + 8x² -4x -3x³ -15x
= -x³ +8x² -19x
d.) = 5(x²y+y²x)-5x(xy+2y²
= 5x²y + 5y²x -5x²y + 5y²x
= 10y²x