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Which number completes the square? x2 − 4x + _____

1 Answer

4 votes

Answer:


x^2-4x+4

Explanation:

In order to complete the square, we need to half b and then square it. This allows us to find c.

In this case, the coefficient of x is b and the unknown term is c

From this, we can see that b = -4

First, we need to half it


-(4)/(2) \\\\-2

Next we need to square it


(-2)^2\\\\4

This gives us our answer of 4.

User Pinchy
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