Mitchell solved a quadratic equation. His work is shown below.

In which step did Mitchell make an error?
5(x−2)² +6=86

5(x−2)²=80 Step 1

(x−2)²=16 Step 2

x²-2²=16 Step 3

x²=20 Step 4

x=±√20 Step 5

Step 3

Step-by-step explanation:

(a - b)² is not a² - b².

Should have done:

Square root both sides after step 2

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft