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9x(5/2)-99=0
We add all the numbers together, and all the variables
9x(+5/2)-99=0
We multiply parentheses
45x^2-99=0
a = 45; b = 0; c = -99;
Δ = b2-4ac
Δ = 02-4·45·(-99)
Δ = 17820
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{17820}=\sqrt{324*55}=\sqrt{324}*\sqrt{55}=18\sqrt{55}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-18\sqrt{55}}{2*45}=\frac{0-18\sqrt{55}}{90} =-\frac{18\sqrt{55}}{90} =-\frac{\sqrt{55}}{5} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+18\sqrt{55}}{2*45}=\frac{0+18\sqrt{55}}{90} =\frac{18\sqrt{55}}{90} =\frac{\sqrt{55}}{5} $
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