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5x*4.5x=78.98
We move all terms to the left:
5x*4.5x-(78.98)=0
We add all the numbers together, and all the variables
5x*4.5x-78.98=0
Wy multiply elements
20x^2-78.98=0
a = 20; b = 0; c = -78.98;
Δ = b2-4ac
Δ = 02-4·20·(-78.98)
Δ = 6318.4
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{-(0)-\sqrt{6318.4}}{2*20}=\frac{0-\sqrt{6318.4}}{40} =-\frac{\sqrt{}}{40} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{6318.4}}{2*20}=\frac{0+\sqrt{6318.4}}{40} =\frac{\sqrt{}}{40} $
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