Answer:
see below
Step-by-step explanation:
by rewriting the function we can see that it has a minimum at
[tex]y=7x^2+7x-7\Rightarrow y=7(x^2+x-1)\Rightarrow y=7[(x+\frac{1}{2})^2-\frac{1}{4}-1]\Rightarrow[/tex]
[tex]y=7[(x+\frac{1}{2})^2-\frac{5}{4}]\Rightarrow minimum \ (-\frac{1}{2}, -\frac{35}{4})[/tex]
bye.
