Math, asked by Akbar111, 1 year ago

If x(x+1)/2=55,then x =?

Answers

Answered by kulbhushan3
0
your answer is in the image.
Attachments:

supersonu: hey x is also equal to _ 11 , plz refer my pic
Answered by supersonu
0
Heya,

Here's ur answer:-
x(x+1)/2=55

=>x(x+1) = 55×2=110

⇒x²+x = 110

⇒x²+x-110= 0

⇒x²+11x-10x-110 = 0

⇒x(x+11)-10(x+11)= 0

⇒(x-10)(x+11) = 0

Let x-10 = 0

⇒ x = 10

Let x +11 = 0

⇒ x = -11

So,

x = -11 or 10


If it helped plz mark Brainliest

Regards
Supersonu
Brainly Star
Similar questions