If x(x+1)/2=55,then x =?
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your answer is in the image.
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supersonu:
hey x is also equal to _ 11 , plz refer my pic
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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
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
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