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21x^2+33x-44=0
a = 21; b = 33; c = -44;
Δ = b2-4ac
Δ = 332-4·21·(-44)
Δ = 4785
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(33)-\sqrt{4785}}{2*21}=\frac{-33-\sqrt{4785}}{42} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(33)+\sqrt{4785}}{2*21}=\frac{-33+\sqrt{4785}}{42} $
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