Question

Which of the following statements is NOT true?

(A) -a(b + c) = -ab - ac

(B) (-b + c)a = -ab + ac

(C) (b + 3c)a = ab + 4ac

(D) b(a + c) = ab + bc

(E) 3a(b - 2c) = 3ab - 6ac

Answer 1

(C)

Explanation:

A is true because -a*b=-ab and -a*c=-ac.

B is true because a*-b=-ab and a*c=ac.

C is NOT true because a*3c is 3ac, not 4ac.

Answer 2

(C) (b + 3c)a = ab + 4ac

Explanation:

If you use the distributive property for all the other choices, they all make sense except for this one.