Solving Quadratic Equations by Taking Square RootsIa

Question

I am stuck on these 2, please help.
7x^2 - 4 = 3

8v^2 - 7 = 713

Answer 1

7x^2 - 4 = 3
7x^2 = 7
x^2 = 1
x = ±√1 = ±1

8v^2 - 7 = 713
8v^2 = 720
v^2 = 90
v = ±√90 = ±3√10