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5x+4x*7x=2x
We move all terms to the left:
5x+4x*7x-(2x)=0
We add all the numbers together, and all the variables
3x+4x*7x=0
Wy multiply elements
28x^2+3x=0
a = 28; b = 3; c = 0;
Δ = b2-4ac
Δ = 32-4·28·0
Δ = 9
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3}{2*28}=\frac{-6}{56} =-3/28 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3}{2*28}=\frac{0}{56} =0 $
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