Answer:
Step-by-step explanation:
[tex]x^{2}-4x =\dfrac{-7}{2}[/tex]
Divide the co-efficient of x by 2 and the then find the square of the quotient
4÷2 = 2
2² = 4
4 Should be added to both sides
[tex]x^{2}-4x + 4 =\dfrac{-7}{2}+4[/tex]
