Original problem: x/12=5/2x+7 (in proportion view) and i got it to: x^2 + 7x=60 and then x^2 + 7/2x = 30 Need help wit the rest please.
In that case cross multiply:
The last form is easiest for completing the square. When I complete the square I divide the middle term by 2 (since when we FOIL we get 2ab as the middle term) and add (before dividing by 2) to both sides to get the constant term
In terms of the quadratic formula: