Question

-25=n/2[2×-6+(n-1)1/2] please solve urgent​

Answer 1

Step-by-step explanation:

-25=n/2[2×-6+(n-1)1/2]

-25=n/2[-12+1/2n-1/2]

-25=n/2[6+1/2n]

-25=n/2×6+n/2×1/2n

-25=3n+n^2/4

-25=12n+n^2/4

-25×4=12n+n^2

n^2+12n+100=0