Question

solve the following equation by formula method n2+5n+5=0​

Answer 1

compare with an² + bn +c = 0

a = 1 ,b= 5 ,c= 5

b²-4ac = 5²-4×1×5

= 25-5

= 5

n = - b+ or - √b²-4ac

............(formula)

therefore -5+ or - √5 /2×1

therefore n = -5 + √5 /2

or

n = -5 - √5/2

these are the roots of given qudratic equation .

hope it will help you .