F(x) = (x+1
how do, I solve?

Solve the equation by completing the square. x^2+2x=17

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

Can someone explain to me how to do