Solve the equation by using the quadratic formula round to the nearest tenth if needed 10x^2-5x-25=0 a) the solutions are about -5.2 and 2.5 b) the solutions are about -1.8 and 2.3 c) the solutions are -2 and 1 d) the solutions are about -1.4 and 1.9 e) the solutions are -5 and 10

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

the answer is b