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3x*5x=15x
We move all terms to the left:
3x*5x-(15x)=0
We add all the numbers together, and all the variables
-15x+3x*5x=0
Wy multiply elements
15x^2-15x=0
a = 15; b = -15; c = 0;
Δ = b2-4ac
Δ = -152-4·15·0
Δ = 225
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{225}=15$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-15}{2*15}=\frac{0}{30} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+15}{2*15}=\frac{30}{30} =1 $
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