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