A more complete explanation:

Distributive property basically means that if you have something like
2(2x+1), you can multiply both things inside by 2, and it will still be the same thing, so, 2*2x+2*1 = 4x+2

Something like -(3z-11) could also be written as -1(3z-11), so would be -1*3z - -1*11 = -3z + 11. Remember that multiplying two negatives equals a positive, and a subtraction problem can be written as an addition problem, so, 3z - 11 = 3z + -11

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