(2x+5)(2x+5)-x(4x-5)=100

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Solution for (2x+5)(2x+5)-x(4x-5)=100 equation: 



(2x+5)(2x+5)-x(4x-5)=100

We move all terms to the left:

(2x+5)(2x+5)-x(4x-5)-(100)=0

We multiply parentheses

-4x^2+(2x+5)(2x+5)+5x-100=0

We multiply parentheses ..

-4x^2+(+4x^2+10x+10x+25)+5x-100=0

We get rid of parentheses

-4x^2+4x^2+10x+10x+5x+25-100=0

We add all the numbers together, and all the variables

25x-75=0

We move all terms containing x to the left, all other terms to the right

25x=75

x=75/25

x=3

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