Answer:
A - He forgot to change the variable b to a negative
B - -4 (5a + 2 -3b)
C - -2 (10a + 4 - 6b)
Step-by-step explanation:
A; The reason that the variable b must be negative is because Josh is dividing by a negative factor, negative four. Therefore, if the number is positive, it must be turned negative, and if the number is negative, it must be turned positive.
B - To factor the expression correctly, take the expression Josh had originally created [-4 (5a + 2 + 3b)] and change the incorrect symbol, plus (+) for 3b to minus (-) to indicate a negative number.
C - This factored expression is equivalent as it shares a factor, -2, and a simplified set of variables within the parenthesis. Therefore, to get said variables, divide each number by the factor presented.
-20/-2 = 10
-8/-2 = 4
12/-2 = -6
Hope this helps!
