3a^2+75=30a

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Solution for 3a^2+75=30a equation: 



3a^2+75=30a

We move all terms to the left:

3a^2+75-(30a)=0

a = 3; b = -30; c = +75;
Δ = b2-4ac
Δ = -302-4·3·75
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{30}{6}=5$

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