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Adding a line through the middle will leave you with a triangle on top and a rectangle on the bottom. Hope this helps!
Answer:
Step-by-step explanation:
Step 1
We factor out 2 so that the coefficient of the quadratic term is 1.
Step 2
In this step we add and subtract the square of the coefficient of the x term, this term is . This is the step where we complete the square.
Step 3
In this step we factor out the perfect square tri-nomial formed by the first 3 terms in last line of step 2. This calculation is shown below,