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15x*3-4x^2-4x=0
We add all the numbers together, and all the variables
-4x^2-4x+15x*3=0
Wy multiply elements
-4x^2-4x+45x=0
We add all the numbers together, and all the variables
-4x^2+41x=0
a = -4; b = 41; c = 0;
Δ = b2-4ac
Δ = 412-4·(-4)·0
Δ = 1681
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{1681}=41$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(41)-41}{2*-4}=\frac{-82}{-8} =10+1/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(41)+41}{2*-4}=\frac{0}{-8} =0 $
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