Question

Complete the square for the expression, then factor the trinomial.

x^2-4x

please explain how to do it as well! :)

Answer 1

0

=

(

x

2

−

4

x

)

−

5

=

(

x

2

−

4

x

+

4

)

−

4

−

5

=

(

x

−

2

)

2

−

9

so

(

x

−

2

)

2

=

9

or

x

−

2

=

±

√

9

or

x

=

2

±

3

so

x

=

−

1

or

x

=

5

Explanation: