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mz: 4 , -8
2(x-4)(x+8)=2(x²-4x+8x-32)=2x²+8x-64
b) y=-2(x-3)(x-1)
mz: 3 , 1
-2(x-3)(x-1)=-2(x²-x-3x+3)=-2x²+8x-6
c) y=4(x+2)(x+1/2)
mz: -2 , -1/2
4(x+2)(x+1/2)=4(x²+1/2x+2x+1)=4x²+10x+4
d) y=1/2(x-6)(x+4)
mz: 6 , -4
1/2(x-6)(x+4)=1/2(x²+4x-6x-24)=1/2x²-x-12
e) y=3(x+1)²
mz: -1
3(x+1)²=3(x²+2x+1)=3x²+6x+3x
f) y=-2(x-3)²
mz: 3
-2(x-3)²=-2(x²-6x+9)=-2x²+12x-18