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-7x(-3x+3)=-21+21x
We move all terms to the left:
-7x(-3x+3)-(-21+21x)=0
We add all the numbers together, and all the variables
-7x(-3x+3)-(21x-21)=0
We multiply parentheses
21x^2-21x-(21x-21)=0
We get rid of parentheses
21x^2-21x-21x+21=0
We add all the numbers together, and all the variables
21x^2-42x+21=0
a = 21; b = -42; c = +21;
Δ = b2-4ac
Δ = -422-4·21·21
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{42}{42}=1$
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