[tex]1. \ 5(-3x+12y-4) = -15x + 60y -20\\\\2. \ -20x^{2}(5x+2y-7z) = -100x^{3}-40x^{2}y + 140x^{2}z\\\\3. \ -2a(-\frac{1}{2}+3a) = a - 6a^{2}\\\\4. \ 6xy(-2x+4y-7) = -12x^{2}y +24xy^{2}-42xy\\\\5. \ m(-4m+3n-2) = -4m^{2}=3mn-2m\\\\6. \ \frac{2}{3}(6a-12b+9) = 4a-8b+6[/tex]
[tex]7. \ (-5x+7y-2z)\cdot(-2) = 10x-14+4z\\\\8. \ ab(-10a+20b-35) = -10a^{2}b + 20ab^{2}-35ab[/tex]
