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9x^2=5x+20
We move all terms to the left:
9x^2-(5x+20)=0
We get rid of parentheses
9x^2-5x-20=0
a = 9; b = -5; c = -20;
Δ = b2-4ac
Δ = -52-4·9·(-20)
Δ = 745
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{-(-5)-\sqrt{745}}{2*9}=\frac{5-\sqrt{745}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{745}}{2*9}=\frac{5+\sqrt{745}}{18} $
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