Answer:
Option D.
Step-by-step explanation:
Distributive law states that a(b + c ) = ab + ac
Option A. -3( 12 + 5) = - 3(12) - (-3)(5)
While the correct solution should be
-3( 12 + 5) = - 3(12) + (-3)(5)
Not correctly used.
Option B.
7(9 - 8) = 7(9) - 8
Correct solution should be
7(9 - 8) = 7(9) - 7(8)
Not correctly used.
Option C.
-2( 15 - 3) = -2(15) + (-2)(3)
It should be -2( 15 - 3) = -2(15) - (-2)(3)
Not correctly used.
Option D.
9(-7 + 6) = 9(-7) + 9(6)
Distributive property correctly used.
Correct Option.
