Question

Solve: 7-4(x-1) = 20

Step 1: 7-4x + 1 = 20

Step 2: 8-4x = 20.

Step 3: (-1/4) -4x = 12 (-1/4)

Step 4: x=-3
Which is the First incorrect step in the solution shown above
A. Step 3

B. Step 4

C. Step 1

D. Step 2

Answer 1

C

Explanation:

given 7 - 4(x - 1) = 20 ( Step 1 is to distribute the parenthesis )

7 - 4x + 4 = 20 ( not 7 - 4x + 1 = 20 ← - 1 is multiplied by - 4 )

Step 1 ← is incorrect → C