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3(2y²+5y+2)=3(2y²+y+4y+2)=3*[y(2y+1)+2(2y+1)]=3(2y+1)(y+2)
b)
2z²-8z+5=2(z-4z+4)-3=2(z-2)²-3=2(z-2-√3)(z-2+√3)