Question

n(n-3)=64 solve for n

Answer 1

n(n-3)=64
n2-3n=64
n2-3n-64=0
now solve the quadratic equation and u will get the answer

Answer 2

n (n-3)=64
n*2-3n=64
n*2-3n-64=0
n=3+/-root 265/2
Hope this may help u...