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(5x+1)(5x+1)=0
We multiply parentheses ..
(+25x^2+5x+5x+1)=0
We get rid of parentheses
25x^2+5x+5x+1=0
We add all the numbers together, and all the variables
25x^2+10x+1=0
a = 25; b = 10; c = +1;
Δ = b2-4ac
Δ = 102-4·25·1
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-10}{50}=-1/5$
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