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5x(2x-3)-21=0
We multiply parentheses
10x^2-15x-21=0
a = 10; b = -15; c = -21;
Δ = b2-4ac
Δ = -152-4·10·(-21)
Δ = 1065
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{-(-15)-\sqrt{1065}}{2*10}=\frac{15-\sqrt{1065}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{1065}}{2*10}=\frac{15+\sqrt{1065}}{20} $
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