(25x^2-70x+49)=0.

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Solution for (25x^2-70x+49)=0. equation: 



(25x^2-70x+49)=0.

We get rid of parentheses

25x^2-70x+49=0

a = 25; b = -70; c = +49;
Δ = b2-4ac
Δ = -702-4·25·49
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{70}{50}=1+2/5$

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