Question

Find the number that should be added to the expression to create a perfect square trinomial.

x^2-7x+?

Answer 1

To find the

c

value

c

=

(

b

2

)

2

, divide the coefficient of

x

by

2

and square the result.

49

4

Add

49

4

to get the perfect square trinomial.

x

2

−

7

x

+

49

4