the difference between two positive numbers is 4. If twice the square of the larger number is added three times the smaller, the sum 53.. Which one of the following is a step of the solution...

a. x=-3(+-)sq.rt 529 / 2

b. x= 3 (+-)21 / 4

c. x^2+3(x-4) =53

d. 2x^2 +3x-65=0

Thanks for the help ive been doing something wrong....