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

Question

asked Apr 15, 2021 158k views

1 Answer

Pinchy · Answer 1 · 2021-04-20T15:37:24+0000

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.