Answer:
On substituting [tex]y = -7 , y^{2} + 4y -1 = 20[/tex]
Step-by-step explanation:
The given expression = [tex]y^{2} + 4y -1[/tex]
Substitute y = -7 in the above quadratic equation:
[tex](-7)^{2} + 4(-7) -1[/tex] = (-7)(-7) + (-28) -1
= 49 -28 -1 = 49- 29 = 20
So, on substituting [tex]y = -7, y^{2} + 4y -1 = 20[/tex]
