5=(1/2)*x*(x+1)

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Solution for 5=(1/2)*x*(x+1) equation: 



5=(1/2)*x(x+1)

We move all terms to the left:

5-((1/2)*x(x+1))=0



Domain of the equation: 2)*x(x+1))!=0

x∈R



We add all the numbers together, and all the variables

-((+1/2)*x(x+1))+5=0

We multiply all the terms by the denominator


-((+1+5*2)*x(x+1))=0



We calculate terms in parentheses: -((+1+5*2)*x(x+1)), so:

(+1+5*2)*x(x+1)

We add all the numbers together, and all the variables

11*x(x+1)

Wy multiply elements

11x(x

Back to the equation:

-(11x(x)

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